IPSEC with remote hosts with same Peer identifier

[alan.llm]

I have one VPN that has been working just fine for the last couple of months. For this VPN, the remote host is behind a router, so I had to force the Peer identifier to the IP that the remote host has in the WAN.
Now I was trying to create one more VPN, problem is that this remote host, has the same IP, so when I try to force the Peer identifier to that same IP that I have on the VPN that is working, both VPN´s stop working.

Is there anything I can do to solve this? My side is a pfSense, remote host is a forti.

Thanks!