Routing Ethernet Connections
Ethernet usually has 100 ohms differential impedance, but 95 ohms is no big deal.

Fundamentally, use one or the other (95 ohm differential or 50 ohm single ended) depending on the differential pair topology.

In terms of impedance, you should try and achieve 95 ohms differential (which will be a tightly coupled pair), and that will usually yield a single ended impedance of about 60 ohms.

If you were to use loosely coupled (or uncoupled) pairs, then the single ended impedance would be the one to use.