in reply to Determine new line number in revised file given old line number

Sample inputs & expected output?
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Re^2: Determine new line number in revised file given old line number
by ExReg (Priest) on Mar 29, 2017 at 19:27 UTC

    Version1.txt

    Line1 Line2 Line3 Line4

    Version2.txt

    Line1 Line3 Linenew Linenewagain Line4
    updated_line_number.pl Version1.txt Version2.txt 1 1 updated_line_number.pl Version1.txt Version2.txt 2 0 updated_line_number.pl Version1.txt Version2.txt 3 2 updated_line_number.pl Version1.txt Version2.txt 4 5