The FSR6B will work with the FR Sky i6, i 10, T6 (which might be the HK-TR6A-V2), CT6B AND TH9X (which is the 'Hobby King' (FR Sky) 9x). I have bought the (Fly Sky) FSR6B and the FSR9B (8CH) and they both work fine on the 9x. Not sure what the difference between FR Sky and Fly Sky is, but it's probably just branding. I think Hobby King puts their own names on everything and modifies model
numbers just to confuse everyone, like saying only their receiver
s match which is not true (perhaps in their product line but not in the real world) you just have to look around and take a punt.
FR Sky make the TH9x (HK 9x) probably the 9XR for HK, the Taranis and a few others. Fly Sky seems to make the cheaper ones i6 (which I think has replaced the 6df) TR6a HK-6DF TGY 6X (hard to find the XR5000,- 7000 RXs anywhere for the 6x) etc.
It might be worth a crack at the 6ch FS-R6B receiver
as the matches mention a T6 TX, not much to loose and if it works, buy a bunch (check EBay, AliExpress and Banggood,-prices vary for the same items) like I did just in case HK dumps it and leaves everyone high and dry, as they have with a number of products. Now days you have to do lots of research and risk a few dollars to win, with all the B/S you get from suppliers,-not just R/C.