Change of design? Different footprint? Tikka footprint is completely different from 700 so they have to have a separate mold anyway. Why not start with a standard Tikka mag mold. Then you likely open it up to a larger market. Only have to have one mold since the tika footprint uses both short and long mags, then you could add the aics mold later if people are requesting it. The only reason I can see for doing aics out the gate is because they've determined their primary market prefers aics with Tika and or doing an aics mold is easier than figuring out the Tikka mag mold.
When I have looked at aics mags for Tika stocks, they cost just as much as Tikka factory mags, and they are nearly always heavier and they always function without fiddling, with the exception of the 2235 round mag. As a mountain hunter concerned with weight, weight and function, I would go with the Tikka factory mags. No reason to add weight to an ultralight stock unless necessary