Is there something done that makes them incompat? I know obviously with Steam it is their client interface. So does GOG change things to their name or something? Just seems silly that there are well 3 versions of the patch. I have noticed that occuring with many games these days, 1 GOG, 1 Steam, 1 U...

Since this was my first ever purchase outside the Steam/Slitherine/Matrix group, do patches and hotfixes (if there ever are any) work on the GOG version? Since as mentioned first time, want to know what I am giving up by going with GOG instead of one of the 3 choices above, scenarios, campaigns, use...