GotC multiplayer mission positioning

A while ago, a friend and I decided to play SR4 in multiplayer. We used Evolve, since I have GotC on GOG (legitimately bought, I can even provide evidence in the staff's inbox :p ) and he has it on Steam. However, he couldn't see my mission markers, and I couldn't see his, but we somehow played on his mission markers.

Is there any difference between the two releases? I am aware of differences in GOG's SR3 which handle DLC differently and break compatibility with Steam users, but GotC?
 
Back
Top