Zwyczajnie, trzebaby było połączyć mody w jeden mod dając skryptowo możliwość dalszej gry jakby w drugiego moda 
No, that's not necessary. LeGo can read and write files with the BinaryMachines:
http://lego.worldofplayers.de/?BinaryMachinesYou have to options: You can simply read in a savegame and try to parse that (although there's an example in form of the "Gothic Variable Editor", this is probably quite hard).
The alternative requires access to the first mod: When you're saving*, "just" create a file with all the necessary information, e.g. it could look like this:
hasKilledBadGuy=1; savedMaiden=0; lootedTreasure=1; gold=1352;
Then you read in that file in the second mod (this would probably require the player to put the file into a special folder/path).
*Use Gamestate (
http://lego.worldofplayers.de/?Gamestate) to have your function called when the game is being saved