Just what it says.... Can you use PISA parts with a freestyle? Specifically, can the Freestyle tubing connect to PISA parts?

I plan to call Medela customer service sometime this week but I think they might give me the "safe" answer of no, make sure you always use the exact parts for the exact pumps, etc. But I have WAY too many PISA parts to just ditch them!

I know the bottles are compatible and the detachable breastshield is the same, but the part where it connects to the tubing looks so different....