I suppose it doesn't really answer GUFCghost's query though in that it doesn't consider what impact summer football had on the difference.
Probably the best way to compare would be when a league changes season - but even then there's other factors that could influence things too. So the LoI season change coincided with lots of money coming into the league. And Russia changed to a winter season to improve European results, but at a different time to us (their focus was on the late-stage group games and the first knock-out ties)
I think overall it's very hard to make a direct comparison from results alone; there's too many variables
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