These are the steps for ArcG
One option may be to use the "Difference" tool in the Image Analysis window of ArcMap. Documentation about this particular tool can be found below:
Using the Difference button on the Image Analysis window—Help | ArcGIS Desktop
Since the difference button makes comparisons pixel-over-pixel, you will want to make sure you preprocess the imagery so that the pixels from both images are aligned prior to differencing.
Retrieving data ...