Are these the RDNA morph packs?
If so I believe they do, I have them in my P6 runtime because I'm still not using P7 fully.
I'm at work now so can't say 100% but I'm pretty sure I used Sydney with those morphs in P6 and yes you can use Sydney in P6 if you ignore all the warning messages [LOL].
If nobody else chimes in I'll do a quick test when I get home for you.

I ended up having to buy the morphs 'cos I bought a character pack and didn't notice it needed these morphs [Duhh!!] so that's next months funds taken care of [LOL].

Injustice will be avenged.
Cofiwch Dryweryn.