Ethernet over power electrical connection signals

Does using an Interent Ethernet over power connection cause any additional electrical energy to come into the device because of this type of connection? In other words, is an Ethernet power line signal connection exactly the same as using a CAT5 connection? Are there any any extra electrical signals coming into the device?

Are there any concerns of using an Ethernet over power connection that might cause any concerns? Any comments would be appreciated.
I used this type of connection for several years and there seems to be no problem with anything else leaking in. My only concerns were with regard to the circuits in my apartment that would work with it as not all did.

I have recently switched to MOCA with greater success.
The main problem with digital transmission is time jitter. Ethernet transmission is jitter free since it does not contain time (transmitted is data) but increased ambient electrical noise might induce jitter in recreated clock, DAC or cable. It is a matter of implementation (amount of filtering, shielding etc.)
Assuming that the particular link functions reliably, and given, as Kijanki indicated, that sound quality is not influenced by link timing, the main question that arises in my mind is not interference TO the device, but interference FROM the device(s). In other words, whether or not the signals that are introduced into the power line by the ethernet-to-power line adapters, that will to some degree find their way through the power wiring into the audio system components, would have audibly significant effects on those components.

I have no feel for the likelihood of that being an issue, and that likelihood, if any, would certainly figure to be dependent on the design of the particular components that are involved. But assuming that the link functions reliably, that is the main question IMO.

-- Al