I swapped out tanks tonight.
It took about an hour and a half by myself. It was a whole lot easier than pulling out the telematic module (unrelated to the fuel tank - it was another mod I did before the tank swap).
I only needed the four parts I listed above. Even the canister fit without any issues. It was pointed out in an earlier post that the white thing on the end that the hose connects to is oriented differently between the 26 and 33 gallon tanks. That is incorrect. In the photo that demonstrates this, the module is just twisted because that's how you remove it. Mine was the same as it is on the 33 gallon tank. The subtle shape difference is of no concern. The brackets on the tank hold the 26 gallon canister perfectly, without compromise.
I didn't use any 3rd bracket and don't intend to use one. I could hang off of the front of the 33 gallon tank and it doesn't move or flex. It's stout. Of course, that is only my opinion. If my truck had the provisional bracket for the strap, I'd install it. It doesn't, so I won't.
I set the fuel capacity to 125 liters with AlfaOBD, filled my tank with about 2.5 gallons from a jug, then went down to the gasoline station and filled it up. It took 30.7 gallons.
I did reuse the heat shield. It was under the truck when I took the pictures.
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