I did this a while ago but I got 2 off the motors and the boards on 1 side wrong and when I did a start up to check if its OK I managed to make my Q500 4k do a backwards flip.
Changed motors with the boards to correct position and loaded QUI for the Q500 4k, did a motor check which found the fault and I turned them by hand and redid turn check and it fixed it.
Brother is still flying in today.