I have Comcast Gigabit Pro which comes with a 6 Gbps symmetrical fiber connection and a separate 1 Gbps symmetrical ethernet connection, each connection having their own block of 5 IP addresses. I've been considering moving my colocated server back home and putting it on the 1 Gbps line, my only hesitation is that the IP addresses between the two connections are so similar. If I was only serving https traffic to the public that wouldn't be too much of a concern, since I could just stick Cloudflare in front of it. However, I'm also hosting game servers on there, and those don't seem as straightforward in masking my IP address. Should I be this paranoid about that? They would be completely separate networks, there's no route from the publicly accessible server into my home network.

You could use something like cloudflare tunnels which wouldn't expose your IP, but would still route the traffic back to you machine.

Ooo that looks promising! I will look into it, thank you for the suggestion.