Hello,
these 2 dlc to arma 2 have better textures. If i will buy these dlc i will get better textures in origins ?
Greetings.

Yeah you get better textures by much skins and vehicles.
It's great

Can i buy these dlc on another account and play with it on another account on origin(of course i have arma 2 with oa) ?

Oh good question.
I don't know but i think yes.