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With a quick minor adaptation:

awk 'getline p<f && /^X/ && p!=$0 {print "Line " NR ":" RS $0 RS p; exit}' f=file2 file1

But now there are more exceptions to consider, for example, are the...

A quick start would be:
awk 'getline p<f && p!=$0 {print "Line " NR ":" RS $0 RS p; exit}' f=file2 file1

But you would need to add provisions for if file1 has more lines than file2 or vice versa

I am 100% sure you can do this easy with awk, but I have not worked much with array.
There you can add an exit if diff found.

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