I try this strange setting and working ok, are this usable for production ?
RB1 have IP: 10.10.30.10 – NETWORK: 192.168.76.55
RB2 have IP: 192.168.76.55 – NETWORK: 10.10.30.10
and ping are working ?

I try this strange setting and working ok, are this usable for production ?
RB1 have IP: 10.10.30.10 – NETWORK: 192.168.76.55
RB2 have IP: 192.168.76.55 – NETWORK: 10.10.30.10
and ping are working ?

There’s nothing wrong with that. It’s the same as this does in Linux:
ip addr add 10.10.30.10 peer 192.168.76.55 dev eth0
It works even with newer (NT 6.x) Windows.