I would question choice of the data structure used.

Given just the context in the OP's question, I would structure %hash as an array, and the problem practically solves itself.

my @arr = qw(one two three);

my @one=@arr;
my @two = 1..$#one+1;
[download]

This, ofcourse, assumes the indices (or keys) are sequential, numeric. If this is NOT the case, it is still more convenient to look at the %hash as an array of tuples, and code it as an AOA, since there seems to be an implied requirement to retrieve elements in a particular order.