ImageMagick to the rescue!
A basic impage comparison is straightforward:
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compare bag_frame1.gif bag_frame2.gif compare.gif
For example:
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compare -metric AE -fuzz 5% bag_frame1.gif bag_frame1.jpg compare_fuzz.gif
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compare bag_frame1.gif bag_frame2.gif compare.gif
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compare -metric AE -fuzz 5% bag_frame1.gif bag_frame1.jpg compare_fuzz.gif