NO. differant.
Appart from the bore size..... where do you go from there.
Ealry DT/RT are non reed blank pistons.............. reed DT2/3 RT2/3 that are Reeds need the 2 windows.
in all the above they made single ring, double ring and also doulble with dykes.
There are heaps of versions, there is some that are better than other for sure same with the rings. Guess if you want to go cheap runabout or race ?
i have a few sets here up to 2mm over what are you after ? i might be able to help ya when you need one, just pm me.