I’ve not transferred any plugs from a UAD1 card as i’ve never had one but i do have a UAD2 quad and solo in my machine and they both perform wonderfully!
You can transfer your plugins from your UAD1 card to your UAD2 solo from your UA account and they should work just fine!.. unless you have Nigel of course which the UAD2 is unable to run…
pertinent question on UA forum… Did they change the sound of EMT Plate 140 and Fairchild between UAD-1 and UAD-2? | UAD, Apollo, and LUNA Forums
and YES they’re ALL available in 64Bit flavour too 
although as far as i’m aware there’s a bug with the Ampex/cubase which UA are aware of…
hth!