Yes, you can use the same network name and password for additional eero networks. If you have multiple eero networks at different locations, you can use the same network name (SSID) and password. The Network Nicknames feature in the eero App makes managing multiple networks easier even if they share the same name.
While you can have more than one network with the same name on one account, eero networks don't share information. You'll need to set up device nicknames, network settings, Profiles, and eero Plus settings separately for each network.
Note: Make sure to avoid having two wifi networks with an identical name in the same location. This will lead to a wifi network conflict. Your devices can't tell the difference between the two networks and may experience connection issues. See How do I resolve wifi network conflicts? for more details.