Interesting, i didnt know you can buy daz models tbh, i thought everyone makes it on their own. This is now starting to make sense.Well the fact this game is slightly older might have given you a clue and especially characters like Evelyn and Fiona were in from very start, so if any copying it is more likely Dr Pinkcake did. Considering fact there are only a finite number of daz models available. It is likely more a case of similar taste between the devs that they modified some models pretty closely and included those in their game.
Does every dev have to do that in their game or what, because if they can also buy that villa and modify it, it would make perfect sense why its so similar, and its fine as long as both are paid for.