Tips to play on modded maps with friends ?

Hey boys, is there a trick to play on modded maps with friends ?

Me and my bro downloaded the exact same mods ( copy pasted from my pc to his one pretty mutch for some mods , not the maps he DL them by himself ) we can play together with mods on vanilla's maps, but modded ones doesn't works , we turned off the checksum setting , tried to keep it on for me or him or both , no way to lunch a modded map the one of us joining keep crashes at the lunch of the map.

all mods DL on Nexus, i would have try to take off all our mods except the maps in case one of them is blocking, but it works on vanilla's maps so i suggest the problem it's about the modded ones.