I have a March 2020 Y and my wife has a Sept. 2021 M3. To me, there's a pretty big difference between the two. My Y has glare at night on both, the colors are a bit more orange during the day (looks more faded), and the refresh rate is slower (lag) vs my wife's M3 repeaters- clear, crisp, sharper colors, and no glare issue.
I thought about upgrading but I have FSD, so going to see if they will retrofit for free or discount down the line. It still works fine during the day and the glare at night doesn't bother me since I check my blind spot manually anyways.