May 4th 2018, 3:16:03
They look pretty similar to me, biggest difference is land based. More land = more population = more income (though increased expenses from land) Watch your PCI for differences. Only other things I can think of is corruption or countries with higher nw incur more alliance costs, but otherwise IDK. Missiles don't have upkeep costs AFAIK.
Have you tried checking what tech you have on hand? Usually when I have a difference it's just that I have different tech levels ie. res/bus/military tech are at different levels :P
It's apparent something is going on behind the scenes that is giving IMP the edge. I just dont know how to prove it, but I know something is going on.