The tab thicknesses on the crankset should be the same although my knowledge of older Dura Ace is very limited and it could well stray from typical standards. Chanring thicknesses have pretty much stayed the same throughout all of the speed changes regardless of manufacturer. The only changes have been the ramps and pins (until you get into the 10/11 speed stuff).
The only issue you are likely to encounter is if you trying using a 6/7/8 speed chain with the 9 speed rings. I tried this and the chain kept getting caught on the ramps and half shifting any time I strayed from a perfect chainline. Apparently not all chainring configurations have this problem though.