Expedition canister should be the same,
other users with same question should check if they have the expedition canister, or the Slimline canister, which is not the same.
Some people like to boast that they never run their lights on full power. I find once you have illuminated the room, its hard to go less bright, with exceptions for really silty diving. Also, my EX35 makes a very faint whine when it's stepped down, so better to just leave it at full blast. And it's so reliable, you probably will never need to use the HP50 corded head. Better to call DR and ask to buy the EX35 head, and the handheld HP50 with battery carrier and 4 18650 cells. That way you have a real flexible backup that can also be used on it's own, or you can use both on the same dive with diffusers to try and film something.