Is the following scheme real?

Question

Network administration

Is it possible to make host A and host B see each other? Any protocol and addressing can be used between routers, hosts cannot be touched.
This is a spherical task, not a practice.
The man proved today that it is possible. But I doubt it. Just in case, I’ll clarify, and host A and host B have the same addresses and subnets.

Answer 1

A variant of the solution with nat - host A accesses the port / range of ports of router B, which forwards data to host B. Similarly, on the other hand.
NAT can be combined with VPN in order to be able to redirect all traffic to hosts without occupying a large range of ports of real ip routers

Answer 2

VPN