The switches look the same at first glance, but the owners manual we got with our truck shows 5,10,15 amps for the various switches (see attached), but I have also seen info from the body builders guide that claims aux 1-4 are 25 amps and 5-6 are 40 amps so I admit to being confused.
I will note that Victron has both an isolated and non-isolated dc-dc charger. We have the isolated. We tested it by attaching temporary cables directly to the battery in our old F350 and it definitely stopping drawing power when the ignition was turned off. We are doing a permanent solution to an anderson connector with our new F550.