I do not understand what this means. 0a1,4 means
"a" denotes an addition. "d" denotes a deletion. The numbers on the left form a range of line numbers in file1. The numbers on the right form a range of line numbers in file2.
and how to make the output files identical
cp file1 file2
cp file2 file1
truncate -s 0 file1 file2
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