The answer is no. All 8 sp and pre 2000 sp had a different actuation ratio on the rear derailleur. Post 2000 9 sp and all 10 sp can be made to work with Jtek #1. Call them up and ask how. It's an undocumented fix. Good luck
According to Campagnolo a 2001 and newer 9 speed mechanism will work with an 8s ergo lever provided that you use a narrower chain (but not a 2000 and older 9 speed lever). Since 10 speed (except 2011 and newer double derailleurs which seem to use the 11 speed ratio) and 2001+ 9 speed share the same ratio you'd expect that to work too although you might run into issues with the narrower jockey wheels if not using a 10s chain.
The floating upper pulley provides some tolerance and I'd guess that it's good enough with the wider 8 speed spacing.