Basically no.
I would love to be able to do reviews of ALL new games, but it is unbelievably time consuming... time I simply do not have.
It's a fair bet that all MG slots pay-back around the same level long-term = 94% to 96%.
IMO I think it's is extremely unlikely that MG games play looser in fun mode than real, and this would be tantamount to deception and probably a breach of licensing conditions for those MGs regulated by responsible authorities.
Certainly in all my fun-play I have never seen anything to suggest it's easier to win, but no-one can know for certain (except MG - and they ain't telling!)
KK