Thanks for the info. I think it's possible this dimension may have varied, depending when the equipment was made?
So far the same 4" or so variation reported here is what I found searching.
I had to know for sure so I unpacked the parts and mocked it up; mine is the 34-34.5" height.
So that was the final factor needed to decide on the height of the post for a good handle to seat, seat to separate work bench and overall height of the case feeder for loading.
Time will tell how it all works out, hopefully I won't need to modify .