I don't think the different division really helps. In fact, I think it makes it worse. If I have a D1 team and a D3 team in one world, my D1 team COULD help out my D3 team quite a bit. My D3 team would have level 4 scouting info on half the country now.
However, if I have two D1 teams in one world, your scouting budget is already so big that it's not like you're gaining a huge advantage. It will help a little but not as much.
Same thing with two D3 teams. D3 budgets are pretty small so you'd gain a little by sharing info but your 2nd team but it can't supply a ridiculous amount of information. Yes, it would help some, but not as much if it were a D1 team.