Image size - Raw vs Jpg

Check your in camera settings. What size jpeg and RAW do you have the camera set to shoot?
 
Only 10 pixels smaller?

If so it sounds like as small amount of automatic pin cushion/barrel distortion correction was applied during the raw rendering.
 
JPEG compresses in blocks - the encoding hardware in cameras often has limitations regarding block sizes, and will crop the image dimensions to a multiple of e.g. 8, 16 or 32.
 
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