I'm pretty sure the 2.0 we are talking about is actually called 31003... (and 310 is actually project 310, not FC-31 003, but 310 03, like J20's prototypes are labeled 20XX). 31002 is supposed to be the one used for static test.
3.0 should have a different label, if it's actually called the J35 then the one that's about to fly in june should be labeled as 3501 I guess.