If you only need to know if the two arrays are identical, you can cheat a little by using join and eq.

@a = qw[1 2 3 4 5]; 
@b = qw[1 2 3 4 5]; 
@c = qw[1 2 3 4 6];

print "a is equivalent to b" if join("\0", @a) eq join("\0", @b);

a is equivalent to b

print "a is equivalent to c" if join("\0", @a) eq join("\0", @c);
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This requires that you data doesn't contain nulls, and it will consume a large amount ram (breifly) if the arrays are large.

However, if you need to know where and/or what the differences are, then there is no avoiding a loop.