@MarkHarrison20 

Hey Mark

This will depend on 2x things..

Are the circuits connected to the same fuse/breaker box?    If they are completely seperate boxes then they liekly will not work, if its just 2x circuits in one house via one central breaker box.. likely will.   Short story there needs to be a link somewhere even if that is back at the fuse/breaker box

Are the plugs different specs?   The AV500/600 range are AC1 and tend to be a good bit 'weaker' on long distance runs, the AV1000+ device are AC2 and perform better.   If you connect an AC2 to a AC1 with some distance between, you mind find the AC2 sees the AC1, but the AC1 cant see the AC2..