For the plain black Pro4-7 typecover, they are the same except for the Fn functions. Zoom in and look at the icons for screen brightness and keyboard backlight brightness controls - they are in different spots.

FMM-00001 vs QC7-00001

https://www.amazon.com/Microsoft-QC7-00001-Type-Cover-Surface/dp/B0163H1HT6

https://www.amazon.com/Microsoft-FMM-00001-Type-Cover-Surface/dp/B073W4MPJF