There are two different standards:
1) Homeplug 1.0/1.0 Turbo for 14Mbps & 85Mbps, such as PL-104 and PL-420
2) Homeplug AV for 200Mbps, 500Mbps, and 1G, such as PL-701
It should work with the same HomePlug AV device which is another PL-701.
It could co-existence with HomePlug 1.0 or HomePlug 1.0 Turbo such as PL-104 or PL-420 in the same domain, but cannot connect with PL-104 and PL-420 (Homeplug 1.0)