By switching network interfaces you likely have switched DHCP leases, which in your case might have lead to a different DNS name. 

I recommend using the `nmap` tool (from [https://nmap.org][1]). 
It's a universal networking tool for a multitude of purposes that belongs into every tinkerer's toolbox. 

Assuming IPv4 addresses in the range 192.168.1.x, the canonical way of probing a local network for running hosts is:

`sudo nmap -sn 192.168.1.0/24`

Substitute the actual address prefix according to your local setup, but keep the trailing zero befor the forward-slash. 

You'll end up with a list of all host names and IPv4 addresses within your local network. Pick the RasPi's IPv4 from the vendor name. 

The parameters `-sn` perform a special kind of probing that looks for running hosts and tries to find their names. 
See `man nmap` (or the online documentation) for a list of parameters and their meanings. 


  [1]: https://nmap.org