If you're not planning on using Damiana on an Aiko 4 figure you don't need to own it.  My own characters all say that Aiko 4 is a requirement but it's only if you want to use it with Aiko 4.  The mesh for both characters is the same so you can purchase this and use it on Victoria 4.2 just fine.  You do  have to have the Morphs ++ though but you already have them.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.