I'm quite ok with Excel so my normal approach would be to insert both pictures in Excel side by side (or whatever), turn grid lines off, add any arrows/text etc, and then take a screen shot and edit the picture (cut/paste to new) as desired and then save that.
I'm managing to do without Excel and learning Libre (see attached)
Thanks @Rufwoof for a very clever approach to accomplishing this need. _________________ Get ACTIVE Create Circles; Do those good things which benefit people's needs!
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3 Different Puppy Search Engineor use DogPile
draw yr two images in inkscapelite and adjust the size of the arrow. draw it where you like. Than take a screenshot with yr screenshot tool.
Pls could you add inkscapelite in you title ( for search tools) if you are happy with it. Only if success _________________ Puppy, buitin power in Paris Eiffel tower