Note that the numbers you are seeing are IP addresses, not network names. I make this point because in the steps below you will be asked for IP addresses.
This mismatch will cause problems.
To correct this, ensure the 192.168.0.40 address of the Pi-Hole is statically assigned in the current router. Then, run pihole -r from the command terminal on the Pi-Hole host, and select the reconfiguration option. You will be asked if the currently assigned IP address is the one you want Pi-Hole to use. Answer yes and continue the steps until the end.
The link provides some additional information on setting static IPs.