These are the steps for ArcG
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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.
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