I recall some people saying they don't work at all, but any that I have tried definitely work.
The only thing to note is the lower hanger, especially on the 9 and 10 will give less kingpin clearance than the older or newer versions, but can be sorted if run on inverted or grinded down kingpins.
There are stages 5, 6, 7, 8, 9, 10 and 11 in my lot and although I have not played mix and match with all of them, I have tried a few options just to see.
For all those who are unwilling or yet to try current stage 11s, they really do turn and skate so much better than all the older versions, but as said, with the round hole they are not so good to convert to the other kingpin version, which is why i use an angle grinder on the kingpin head which makes them work really well.
I have almost all the older ones only set up on cruisers with soft or cut down stock bushings so they are really turny on the setups I have them on.