Not really.
Van Pelt: "As we have seen Tauber had described them as three structures of ever finer mesh. Within the innermost column there was a removable can to pull after the gassing with the Zyklon "crystals," that is, the porous silica pellets that had absorbed the hydrocyanide." (pg. 206)
Kula:
"The third part of this column could be moved. It was an empty column with a square footprint of around 150 millimeters made of sheet zinc. At the top it was closed by a metal sheet, and at the bottom with a square base."
You are trying to say the movable column is the can, but I don't think it is. The can would not be described as an "empty column with a square footprint."
Plus then Kula says: "This mesh ended at the bottom of the column and from here ran in the [collection cup] of the screen a tin frame until the top of the column." The term in brackets that you left in German when you quoted it Van Pelt renders as "collection cup." That's the closest thing in Kula to the "can" in Tauber's version.
"After the evaporation of the gas the whole middle column was taken out."
I think that last part settles it. He clearly says the whole big ass column was taken out, not just the can (or collection cup).
Again, the diagram below is Van Pelt's harmonized version, based on BOTH Tauber and Kula. The removable can is the little thing in the middle. That comes from Tauber.

I think we really need to see this process dynamically. Like video simulations.