I'd ask for a copy of your file from the old FS first. He may be interested to look through it while you talk. Or you could arrange for it to arrive there before your appt so he can review it beforehand.

We changed to a new FS after 4 (fresh) cycles (our first FS referred us to the second one and arranged for our file to be forwarded) and we have just changed again this year (second FS doesn't know we've changed to the third). Because we've stayed in the same clinic it's a bit easier for us - they can all access all of our results from the clinic's lab.