A small correction. There seems to have been some confusion at the time Emanuel Beranek left and this vase appeared with three numbers, two were slightly different. The differences you noticed in your first post are explained by this, not just hot worked production. The vase 5857 became 5933 (the vase we have) and then later Stahlikova redesigned it slightly and the one you refer to in CGR is 6017 with one peak as you describe it. This is credited to Stahlikova-Veliskova, along with lots of others they designed using a murano style with a creative Czech design twist. They together also designed successfully as a team at Harrachov, using techniques of fibres inserted into the glass, seemingly related technologies to the Harrtil and equally as impressive, perhaps more so.
I attach a picture of my vase and I have label envy. My label is in slightly worse condition. You can see some differences in hot worked production between our vases though, the shape and quantity of colour is different and the applied piece is slightly different.
The use of a specific factory label or not, I do not know about though. Maybe some sellers preferred one or the other, possible export rules for different countries, I do not know.