I ordered a single rotorx 1105b motor from a different site because getfpv was out of stock at the time and when I got the motor it looked like 99% the same as the others. It had little bit smaller wires and ever so slightly shorter bell. Like maybe 2/5th of a milimeter lol. It works fine however it spins very slightly faster than the others at the same thottle value. Like you can hear the motors perfectly in audible tune at say 1200 throttle but the one motor will sound a little tiny bit higher pitched, if I drop it down to say 1176 it would then sound in tune with the others. This wouldn't effect much at all right? Unless it was max throttle I'd assume. Is there a way to adjust for this?

In flight the FC should correct the variation of the motor if I am not mistaken.

I think voodoo614 is right, the FC should correct for it.

Skitzo FPV released a video a while back where he installed 4 completely different motors and props and it flew surprisingly well, the FC's do a great job of accounting for differences in thrust. Look up 'frankenquad' if you're interested in his video.

That's awesome. Yeah I did some test flight even maxing throttle out for some bursts and it seems fine after all.