Well, if nothing is printed out it is unlikely that they are the same, notwithstanding appearances. Perhaps there are non-printing characters in one of the strings. You could examine each string character by character, doing it something like this, where to demonstrate I put a NUL in the middle of the string.
$ perl -le '
> $str = qq{ab\0cd};
> print $str;
> print ord for split m{}, $str;'
abcd
97
98
0
99
100
$
Note that the NUL doesn't show up when the string is printed but can be seen when each character's ordinal value is printed.
I hope this is helpful.
Cheers,
JohnGG
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