All of my A4 clothing fits my V4 character but only because it's like wdupre stated. You have to have the A4 morphs to inject into V4.  You have to have both bases and the Victoria Morphs ++.  If you want to use the V4 facial expressions then try reducing the Aiko 4 morph dial to 0 . This will give her a V4 face and the expressions should work then. 

I did a morphing workshop where I showed that the 2 bases were exactly the same (after I inject the morphs).  The V4 facial morphs should distort the closer you get to the Aiko 4 look.