Ferrite ring vs ferrite choke interchangeable?
It should make no difference either way, as long as it is only a single pass through the center of the core. This filters out-of-band HF harmonics. Multiple passes through the same or 2 cores may start to affect signal strength.

Note that at very low bit rates (Kbps) you could add extra turns (better filtering) through the core but you would be locked out of a shift to a much higher bit rate. Mbps is only possible with just a single turn (pass) through the ferrite toroid or clamp-on.