as some guys in other forums said, canon never used a sensor twice in different bodies. some are quite similar. fi an 18mpix-sensor first built into the 7D (
~18Mpix crop1.6) was used later on in all crop-bodies until 70d. but it wasnt the same. so, if you figured out a good algorithm against rolling shutter, its results should differ on 7d and 550d. and its quite strange to say,
5DIII and 6D have "the same" sensor - different resolutions on same size..
maybe you mean something like readout-circuitry..
regards chmee