Est-il possible d’ajouter un récepteur dans une autres pièce?

Oui

Si oui, tous les CPL sont-ils compatibles?

Non

p.ex.

Devolo

https://www.devolo.com/support/faq

Are dLAN adapters of different speed classes (200, 500, 650, 1200) compatible?

Yes, dLAN products of different speed classes are fully compatible with each other.

The only exception here is old devices with a speed of 14 and 85 Mbps. Unfortunately, these are not compatible with current products.

For technical reasons, devices from the devolo Magic series are not compatible with dLAN devices.

In a mixed network, each adapter connects to every other adapter at the highest possible speed. It does so independently of the other adapters in the network. In a network consisting of a 500 Mbps adapter and two 1200 Mbps adapters, for example, the 500 Mbps adapter will connect to the 1200 Mbps adapters at a speed of 500 Mbps. At the same time, the 1200 Mbps adapters connect to each other at the full 1200 Mbps.

A ma connaissance les (anciens) CPL de Proximus était fournis par Devolo (type dLAN)