Hello
Difficult question to answer. It is not that straight-forward.
What I know from my experience:
Going down through technology nodes has several advantages, such as less parasitic capacitance, better gm performances, better output impedances... Tendency is that performances of the circuits are better.
I am afraid you cannot draw a clear conclusion. The key is simulation.
You need to resimulate all the circuits you are transferring to 65nm node. By then you will be able to tell what has changed.
Cheers
Christian