WAN and LAN in same IP Segment

Hello everyone,
Recently an old RUT stopped working on site.
The router establishes a VPN connection so that we can service our equipment remotely.
So I send a new RUT956 (which we have already installed in several other buildings).

The VPN connection works, but I cannot access our equipment.

It turns out that the IP segment for WAN and LAN are the same.
So instead of being able to reach my devices, I can reach the Fritz Box that provides the internet.

Is there any way I can get access to my LAN devices without changing all the IP addresses?
I’m really confused as to how it worked before.

Thanks for the help.

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