Is there a dedicated port that the proton vpn client uses to connect to vpn servers?

VPN
1

I’d like to do some network prioritization with my router, putting the vpn’s traffic lower than folks who are not using that traffic. I’m not positive if the ports that are present via the client are the same ones that are actually exiting my router.

2

I believe UDP 1194 and TCP 443.

But as stated here, these can differ: