Well, "du pareil au même" is indeed an expression...
when we say "c'est du pareil au même" in a sentence, that means "it's the same thing anyway".
We use it at the end of a sentence, when there is a comparison between two things.
another french expression is closed to it: "c'est blanc bonnet et bonnet blanc" (white hat or hat white)
like:
"préfères-tu ce pantalon ou celui-ci?
- c'est du pareil au même"
and the website is:
http://www.dpam.fr/(dpam are the initials of Du Pareil Au Même)
good shopping!