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please forgive me - i lied to you (see answer 2). because of my own stupidity i couldn't realize at first that hex (goal is to compare hex code) could be letters too. so was the previous success based only 1 test with few lines. anyway, after trying this and that, script starts giving false results,...

thank you! it works exactly as needed

1) no, both files have always same number of lines
2) yes, always numbers

i would like to have file1 compared with file2, line by line, and then output results to file3, so the matching lines remain same but non-matching are replaced with -- for example.