I really think different kinds of warehouses of the same physical size, should have the same number of slots.
Else it "breaks" the place over feature.
If you would replace a storage warehouse with 200k plates in it with any other of the same size you would end up with a 120k item bomb.

I know about this, however, it is a bug in the base game that the developers need to fix internally, all i can suggest right now is to be careful, i do want the storage warehouse to be MUCH larger than the other variants, so i'm not going to change this at this stage