i don't know this for a fact and, since i don't read any of the asian languages, can't say if its documented anywhere, but just eyeballing it the moonbus looks to be about 1/72 and the ares appears to be about half of that [1/144].
don't take that to the bank though. i looked on both models [i have them downloaded] and don't see any notations. i'm just basing it on the apparent size of the characters included in the moonbus model and the fact that the doors on the ares are half as big.
cheers