# in Script #1:

my $file = 'script1_final.txt'; # add path as required
open(my $fh, '>', $file) or die "Cannot open file '$file' for writing: $!";
print $fh $final;
close $fh;

# in Script #2:

my $file = 'script1_final.txt'; # add path as required
open(my $fh, '<', $file) or die "Cannot open file '$file' for reading: $!";
my $final = <$fh>;
close $fh;
unlink $file             or warn "Cannot delete file '$file': $!";

# Use $final as needed...