In order for someone to access two different server located on the same network, both servers would need to have different ports. For example, the windows one may be example.ip:25565 and the linux on could be example.ip:25566. The ip that others type in would be the same but the port would have to be different.
When I set up my first server off my computer, I wondered this as well. The problem isnt that the ports are wrong, but you need a different IP address to access the server from a different computer on the same wifi. To find this IP address, go onto the computer that you host it on. Go to the cmd and type Ipconfig. Find an entry named IPV4 address. Use that address to access the server on other computers in the same wifi.
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~Boss