Why does one contradict the other

Viking1237

Honorable
Nov 30, 2013
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on xbox.com it says xbox one network ports are http://gyazo.com/b0c4b8d5f3ce4aa7eb656dab28e57d60

but on portforward.com it says the ports are http://gyazo.com/4bd621402d8270f4078dc051bf25e95e

they are both very reputable websites so why does one have more than the other and should i or could i forward what portforward.com says just to be safe is there any harm or benefit to having more ports than necessary

or could i take it a step farther and forward every port possible so i don't ever have to worry about it like put a range of ports and make it the maximum in the rules
 
Solution
I had to use a DD-WRT router hooked up only to my xbox while recording firewall log to see what ports were opening, etc.

That was my way of guaranteeing what network ports are being used.