Yeah these are both OG classic shape
formula four, not to be confused with OG Classic classic OG formula 
Theres a 1.5mm difference in contact width, wouldn’t think that’s much at all but on the same ramp it was the difference between ice rink slams and complete grippy confidence
The size wouldn't make much difference at all, but as you said the feel of them is key.
I have experienced that a lot more with 101s with some being super slick and slippery and others being even more grippy than the 99s, but to me the normal 99s have always been the same feel. That is not to say that something happened and they are mixed compounds or something else going on (like surface slickness on the slippery wheels) but at least if you found some that did work, then that is all that matters.
The newer 97s I have used on wood, skatelite and other surfaces were pretty good, but I could feel them being slightly slower at the same time, when compared to my other 99s, otherwise I would say try some of those. I still like them anyway, as do other people for more slippery ramps or for rough ground, so there will always be a place for my usual 99s as well as the other softer wheels on boards I have set up as regular riders.