Don't get too hung up about the different standards; they're all backwards-compatible and different adapters from different manufacturers will work together. However, mixing and matching can impact speeds and there's no guarantee that a TP-Link adaptor will work seamlessly with one from, say, TRENDnet or Devolo.

Can you mix and match TP-Link Powerline adapters?

All TP-Link Powerline adapters are backward compatible. However, if two different adapters are being used with each other, the Powerline rate will automatically run at the lowest adapter's settings. ... We recommend all adapters used on a network be the same brand. Powerline products need to be paired to work.

Can I use different brands of Powerline adapters together?

You can mix and match Powerline adaptors running at different speeds and from different manufacturers – as long as they all support at least HomePlug AV. Naturally, faster adaptors can talk to slower ones only at the lower speed.