There is a big difference .. The first Counter-Strike games, aka CS games, is using the GoldSrc, or Half-Life 1 Engine..Half-Life 1 and many other games, used that engine..A couple of years later,...
Sadly no, since the server technologies are separate entitys, Counter-Strike: Source can not connect to any other game, and any maps, mods, or servers from 1.5 or 1.6 cannot be used in...
Sadly no, Counter-Strike 1.6 or 1.5 maps are not compatible in Counter-Strike: Source, however many map authors have re-designed their maps to be compatible such as "surf_ski" and "scoutzknivez", and...