If you connect your Macmini direcly on the Macpro and you follow what I have suggest you to do, your Macpro will be on the same network than your router (usaly it is 192.168.xx.xx), and your Macmini will be on a different network number
This is what is happening when I connect my two Macpro
MacBook Pro M3 MAX 128 GB 8TB - 2 x 48" screen --- Logic Pro --- Mir Pro 3D --- Most of the VI libs, a few Synch... libs --- Quite a few Kontakt libs --- CS80 fanatic