All tplink powerline units are compatible with each other. The thing is the powerline rate will be limited by the lower one in the network, if you pair a AV600 with AV2000, the powerline rate between them is 600mbps maximum, in other words, actual internet speed is about 240mbps. And if the AV600 has 100mpbs Ethernet port, it cut down to 100. That's not a problem if your network speed is that fast. They don't sell single powerline any more, if any, the model is old, like WPA4220. Maybe you can still find it online.

Following on from the above post, If I have 2 x AV2000 and 2 x AV600 on the same powerline, would the theoretical speed between the 2 x AV2000 be cut to 600mbps?

Vipermk2 wrote

Following on from the above post, If I have 2 x AV2000 and 2 x AV600 on the same powerline, would the theoretical speed between the 2 x AV2000 be cut to 600mbps?

Yes, it will decrease to AV600mbps if you pair them in one powerline network.

Unless we pair them in two seperate network, we can enjoy AV2000 in one network.