01:40 is more than enough time in Copenhagen, minimum you'll need as it's intra-Schengen without luggage is 25 minutes. There are no passport checks, no additional security and Copenhagen is a very efficient transit airport. Worst that can happen is you'll arrive at an A20ish gate and depart from a D gate, which is a 600-700 meter walk. But chances are both flights will be from the A-gates, and then your only worry will be what to do with the an hour and 30 minutes of waiting time.

No worries at all.