Hi g1881c,
It’s still very early and the bed and you haven’t really begun to go through the initial break in and adjustment period yet so it really isn’t possible to say how close you came but I would also keep in mind that any mattress that doesn’t use the exact same materials and layering wouldn’t “duplicate” another one anyway.
The first step would always be to talk with the manufacturer themselves who are more familiar with their mattresses than anyone else (and Ken is also familiar with the Beautiful). The mattress you have would be close for many people because they both have a top 3" layer which is similar (and the top layer contributes the most to the “feel” of a mattress) but comfort is so subjective with different body types, sleeping styles, and perceptions that “very close” for one person may be “not very close” for another.
Some of the other things that I would consider are listed in post #2 here.
You can see the layering of the new PLB Beautiful here.
This again would be based on your personal perceptions. You may be lighter than most or have different perceptions from the “average” but for most people the Beautiful would be more than a “slightly sinking in” feeling because it is close to the softest mattress in the PLB line.
If two of the layers you have are similar to two of the layers in the Beautiful (the 6" of 36 ILD and 3" of 21 ILD), then adding the missing layer of 3" of 24 ILD as your comfort layer and using your 19 ILD on top would be as close as you could come (assuming the base layer is also the same) although there would still be some differences because the cover and quilting is different, the comfort layer has a slight difference in ILD, and a topper will have a slightly softer feel than the same layer inside the mattress. The closer the layers “match” in both type, ILD, and thickness the better your odds that the “feel” will be similar to you. The Naturalux is Dunlop so it will feel firmer and not as “lively” as Talalay although once again … some people may feel it is very close and others not so much.
The most important things you can do though would be to first talk with them in person and I also wouldn’t consider any type of change until you have been sleeping on a new mattress for a minimum of 2 weeks … and preferably longer … and then use your experience on the mattress after it has broken in a bit and you have gone through your initial adjustments to a new sleeping surface to decide on what the next step may be.
Phoenix