but I have thought about there is a pack with the maps from SWBF 1 without new units, new heroes and all that stuf, just the maps with the normal SWBF 2 units?
To my knowledge, no. However, regarding the Conversion Pack itself - all the BF1 maps have BF2 units, but yes, there are a couple extra units added on when you play them. However, each of those same BF1 maps also have a mode called "Classic Conquest" that allows you to play through those maps with the basic Battlefront 1 units.