Hi Shelby,
Welcome to the Mattress Forum! 
You’re welcome and thanks for the kind words.
[quote]I have found a great deal on Amazon through a company that has been wonderful to work with – very helpful and informative. The brand they sell is PLB
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I would be very cautious about purchasing a discounted Pure Talalay Bliss (they changed their name from Pure Latex Bliss in March, 2016) on amazon. Pure Talalay Bliss has a strict dealer pricing guideline, meaning that there is a minimum price that all dealers may advertise their products at, and any advertised discounted price would send up a “red flag”. I would want to find out that any retailer you’re considering is an authorized retailer of the product you’re considering, which may mean in this case a direct phone call to Pure Talalay Bliss.
The Pure Talalay Bliss site lists the Eco Mattress Store in Buffalo Grove as the closest to your area.
The response rate of the customer service department of Pure Talalay Bliss has unfortunately been the source of many complaints. I don’t know if it still works, but you may try 203-924-0700, x 341 and see if Roland Brown is still there – he was a nice senior customer service rep. Otherwise, I would continue to phone their customer care number at 404-260-7421 until you reach a real person.
While the types of mattresses you’re considering certainly contain durable and higher quality materials, all I can offer is help with “how” to choose. It’s not possible to make specific suggestions or recommendations for either a mattress or combinations of materials because the first “rule” of mattress shopping is to always remember that you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved that are unique to each person to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components or which type of mattress would be the best “match” for you in terms of “comfort”, firmness, or PPP or how a mattress will “feel” to you or compare to another mattress based on specs (either yours or a mattress), sleeping positions, health conditions, or “theory at a distance” that can possibly be more reliable than your own careful testing (hopefully using the testing guidelines in step 4 of the tutorial) or your own personal sleeping experience (see mattress firmness/comfort levels in post #2 here). The Beautiful is one of the softer models in the PTB lineup and in general is popular with side sleepers with the use of a 3" softer Talalay layer on top, but that is a general statement.
There is more information in post #9 here about the different ways that one mattress can “match” or “approximate” another one. Every layer and component in a mattress (including the cover and any quilting materials) will affect the feel and performance of every other layer and component and the mattress “as a whole” so unless you are able to find another mattress that uses exactly the same type of materials, components, cover and quilting, layer thicknesses, layer firmnesses, and overall design (which would be fairly unlikely) then there really isn’t a reliable way to match one mattress to another one in terms of “comfort”, firmness, and PPP (Posture and alignment, Pressure relief, and your Personal preferences) based on the specifications of the mattresses (even assuming that you can find out all the specifications you would need for both mattresses you are comparing in the first place).
Unfortunately, there would be no way for me to determine what may or may not feel more “sinky” to you based purely on specifications. Your personal preference when trying out a product would be the only actual indicator. The layers closest to your skin will have the most dramatic impact upon initial comfort impressions, and the Natura uses a different cover than the PTB, it has a wool layer (the PTB has none), and the upper 3" of latex are a split of Dunlop and Talalay which are of a slightly higher ILD than in the PTB. So while it may be in the same “range” of softness, it certainly isn’t the same, and the degree of similarity would only be able to be determined by your own personal testing.
Both of those models have a different feel, with the most obvious difference being that the Nutrition uses a bit of a firmer layer of latex on top of a bit of a softer layer of latex for the two upper layers, what I term placing a “dominating” layer on top. The Nutrition isn’t just a “flipping” of the top two layers of the Nature – they are different ILDs and thicknesses. The Nutrition in general will present a bit more of a “firmer” surface comfort as compared to the Nature, and both models would feel firmer than the Beautiful.
The quality of componentry is certainly high with the PTB product, but they can be in a bit of a higher budget range and may not be in the best “value range” when compared to other manufacturers who use similar materials in lower budget ranges. If you are interested specifically in latex then this link in the tutorial is to a list of the members here that sell mattresses online and many of them sell latex mattresses that use different types and blends of latex that have a wide range of different designs, options, features, return and exchange policies, and prices that may be worth considering.
Phoenix