For spare parts, it is best to contact our customer service department directly at https://helpcenter.galaxus.ch/hc.... Your enquiry can then be examined individually.
I don't think there is a difference. The more expensive version simply comes from a different supplier (Ikarus CH), who in turn probably sends a different manufacturer's article number to Digitec/Galaxus. It is probably simply a mistake :)
Unfortunately, this is not a property about which the manufacturer provides information. I.e. it cannot be assumed that Post-its will last longer on this glass board.
Yes this is possible.
(However, I personally have not done it: It is definitely possible, the cut-outs at the back of the board for portrait mounting are there).
I think the normal magnets will also hold, it just depends on how much or what you want to attach to them. For 1-2 sheets, however, this should certainly not be a problem.
The information under specifications should be correct and binding. The description may apply in part to the different sizes.
Tip: It is best to copy the manufacturer's number and check the product with the manufacturer for precise specifications and further information. -> https://www.sigel.de