From the posts I've seen they are compatible. It's going from BRZ -> FRS might be an issue since BRZ uses a different connector.
https://www.ft86club.com/forums/show...4&postcount=22
https://www.ft86club.com/forums/show...3&postcount=19
I didn't really like that headunit and somehow used it for 3-4 years. Mainly because the shuffle function doesn't really shuffle and just replays the same songs in the same order. It's sitting in a box in my closet as I'm unsure what to do with it.