Multiple sites and tunnels - issues with identical VLAN and IP ranges? Recommendations on staying consistent and avoiding conflicts?

I'm sorry if this is too beginner for this sub but I'm not sure where to ask. I'm trying to collect ideas/suggestions/best-practices for scenarios where you have separate entities/companies that require tunnels to each other for certain networks at each of those buildings to be able to reach a server at one location.
For example a security system with cameras. If you've got 2 separate buildings (A and B), and the server and cameras are at site A, but there are cameras at site B that need to link to the server at Site A, and cameras require IP addresses, then what is the best practice for IP ranges at each site? Would a tunnel between the firewalls lead to IP conflicts if Cameras at Site A has the same IP as one at site B? Like 10.105.1.8? or is it best practice just to ensure ranges are unique and separate?
Right now it's a theoretical question, no specific hardware or software involved at this time.
Just curious if multiple sites can have same uniform VLAN and IP ranges to keep documentation easy and management consistent.