I’ve noticed a few posts about trainer vs. power meter accuracy. Something I came across not too long ago that may be of interest to others is the Zwift Power tool that will compare your saved Zwift ride (I think one of the files needs to be recorded on Zwift to work) to a 2nd dual recorded ride. Here’s a couple of screenshots…
I used my trainer for the Zwift ride and then dual recorded my power meter using a Garmin computer.
If you have a ZP account, go to your profile page and then click on analysis and choose “create a new data set.”