2 x Ring Pro 2's coming - now I'm looking at existing doorbell wiring ...

Hi! I have a pair of Ring Pro's coming next week. I have 2 wired doorbells and 1 chime. The labelling on the existing chime is minimal (nothing saying Front, Rear or Trans) 1 see numbers 0,1,2 and 3. I assume 0 is the Trans because all of the white wires go there. I assume 1 is power from the box and 2 and 3 go to the doorbells. Is there an easy way to test? I was thinking of turning the power off at the panel, taking off one wire, turning power back on and testing to see which door bell does not work. Does that make sense?