Is EB2 the same as EB1?

[Ludens]

Just as a confirmation, EBII is essentially an updated version of EBI with better graphics, engine, etc?

Yes and no. EB2 has the same goals, principles and (mostly) core team as EB1. However, the team is reconcepting most of their work for EB1 in order to make EB2 more realistic and better to play.

i hard AI is stupid with med 2 compared to rtw true ?

The A.I. of M2:TW is certainly not worse than that of R:TW. I would argue it is better, although not exactly good. Modders have more options for improving the M2:TW A.I. as well.