I haven't tried it on anything recent myself, but at least the slightly older IBM-branded FAS270 filers did work with regular NetApp shelves without any problems, I am pretty confident this still holds true for the newer systems. Anything else would be strange, since the shelf hardware and the operating system is identical (except for the copyright string).
You probably won't have support from IBM (or Lenovo?) for these shelves but I'm sure you're aware of that