I think it is more of a question of how she fits in and being more of a potential type prospect because of her physical abilities. Also the position. While both might be considered mostly 4's, Ice might be more of a 4/5 that depending on Amari could find a significant role as Dorka's backup.
Ayanna might be more 4/3 because she could defend the 3 with her length and quickness, but we have two very good candidates there in Caroline and Lou that are 3 pt threats, and if Geno wants to go defense there Aubrey could be that specialist as well. So she has a ton of competition at the 4, and also a great deal at her second best position. Ice has the same competition at the 4, but a clearer path to playing time as a backup 5. There it all depends on Amari, if she is ready Geno might not need to use a PF as the backup C, but if Amari fails to take that position, Ice as a relatively polished prospect with enough bulk to be the next best choice.
I could see Ayanna taking a little bit longer to find her way offensively than Ice who appears to have a well developed low post game and a decent perimeter game. Ayanna can probably be a good rebounder, defender, shot blocker from the start, but her offense in high school was mostly interior shots where she just goes over people, relying more on her athletic ability than her skills. Ice is more the opposite with skills that are more ready for primetime, and athletic ability that is still pretty good, but not in Ayanna's league. In the long run I have no idea which will be the better player, but think Ice is closer to being ready offensively, and may have a better path to getting minutes at C particularly if Amari doesn't advance.