Easiest thing is just to do a ramp test, 3min blocks at 25w increments on each power meter (using the Kickr's power as your reference). Then you can check offset as well as slope.
Would you record one on say trainer road and one through your head unit?
@xavierdisley started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
Easiest thing is just to do a ramp test, 3min blocks at 25w increments on each power meter (using the Kickr's power as your reference). Then you can check offset as well as slope.