Hi Tyson,
No because it would depend on the type of latex they use in the Naturally Bobs, the type of base foam, and the ILD’s of both. Without this information it’s really not possible to know how it may compare. If you at least knew the type of latex and the ILD of the Naturally Bobs, you would have a reference point for the comfort layer and it could provide some guidance for the ILD choice for the comfort layer of the Ultimate Dreams (which has many choices and each of these would feel different) but this would also need to assume that the ILD of the base foam was similar.
So lying on the Naturally Bobs would give you a sense of the “feel” of whatever type and firmness level of latex they use but because the details aren’t known, beyond this it really wouldn’t help with a choice of the UD comfort layer choice.
If you could phone MyBobs and find out some of the missing information it would be a much more valuable reference point (see post #4 here with more about MyBobs)
Phoenix