Wiring Lipo's in parallel Question

[Marvin]

If I want to wire two lipo's in parallel, I understand that obviously, they have to have the same voltage, same C rating etc. However, do they have to have the same capacity? I want to wire two 6S Flightpower packs (a 2550 and a 3250) in parallel, both are 20C continuous, both are (obviously) Flightpowers, both are the same Voltage etc.

Is this Ok? I would have though that it would be, but I'm after some more opinions.

Thanks