Just a little clarification. You call it "Zone 2", and talk about matching speakers with your main zone.
First decide if you want the capability of listening to 2 different sources in the 2 rooms, at the same time. If it is possible you'll want to listen to one thing in the living room while listening to something/anything different in the dining room, then you are indeed talking about "Zone 2". On your AVR, Zone 2 is a pre-out, meaning it is not amplified and cannot simply be hooked to speakers. You will need to buy a second amp.
If you want to only use your AVR, I think your only choice is to use the Multi-Channel setting. It means connecting the second room speakers to your Surround speaker outputs. That has a couple disadvantages. You will lose surround capability in your main room. You will lose easy, separate volume control in your second room. To change the volume in your second room without affecting the main room, you'll have to go into your AVR settings and change the volume of those 2 speakers separately. It's not hard, but it's not as easy as just turning a knob. Without doing this, changing the main volume will change it in both rooms.
Either way, I do not think it is important to "match" speakers in two different rooms for listening in a third room, (kitchen).