Hey comp666,
Welcome to the Mattress Forum! :). Thanks for the post.
I am going to answer a couple of things then give you some background links that may explain things better.
The short answer is yes the 14ild will most likley feel softer, but its more complicated than that. Also 19ILD Talalay will not reallly feel similar to the 20ILD Dunlop latex, more info on both of these points below and in associated links. I think 19ILD talalay is good choice to try for your particular situation.
Latex and memory foam are very different materials and can’t really be meaningfully compared to each other. You can read more about this at this post #2 here.
Latex is highly resilient, has a more “on the mattress” feel to it, and responds to pressure. What you feel on latex stays the same over time. You can read more about the pros and cons of latex in this article and more about the different types and blends of latex in post #6 here.
Also, what was the density / ild / brand of the memory foam you tried?
Another point, even though latex is “cooler” than memory foam, generally speaking…putting a plush talalay topper on mattress can sometimes “feel” hot becasue the latex envelops your body, thus covering more surface area…leading some people to love the feel but still be a bit too hot. Just FYI so you know going into it.
Thanks again, and please don’t hesitate to ask any other questions you may have.
Sensei