TL;DR Jump to the bottom, putting question first seems strange.

I got 2 servers sharing 1 external ip, i use one server for x y z and the other for a b c, so they dont use the same ports.
I got told i would need 1 dedicated ip per server, and i refuse to believe that since everything works fine. However, some things would definitely be alot easier having an ip per server.

So, does anyone have experience with getting an additional ip for your home connection?