Bits are binary digits used for mechanical computers. Human brains are constantly changing chemical systems that don’t “process” binary bits of information so it makes no sense as a metric.
imagine someone tells you they measured the temperature of a distant star, and you say “that’s stupid, you can’t get a thermometer to a star and read the measurement, you’d die”, just because you don’t know how one could measure it.
It’s not about how you measure it, it’s about using a unit system that doesn’t apply. It’s more like trying to calculate how much star costs in USD.
If you’d like to run them on the same Ubuntu VM, I’d recommend deploying them using docker, as that will make avoiding port conflicts much easier as well as keeping each application isolated.
You should also look into a reverse proxy so you can reroute traffic from your desired subdomain to non-standard ports (otherwise you’ll need to specify ports in the URL which gets weird). I recommend Nginx Proxy Manager which can also run in docker.
You could spin up another VM for Lemmy if resources get tight and you don’t mind the extra cost.