I though about diff, but I'm mostly on Win and was too lazy to fire up the VM for that °...

But now I remembered gitbash ...

 MINGW64 ~
$ diff -u \
>    <( perl -Mstrict -Mwarnings -MO=Concise -e'my ($u, $v)    = split
+ /,/, "U,V";' 2>&1 ) \
>    <( perl -Mstrict -Mwarnings -MO=Concise -e'(my $u, my $v) = split
+ /,/, "U,V";' 2>&1 ) \
> && echo same
same
[download]

thanks! :)

°) and I firmly expected someone would do it for me anyway ;-)