I had returned the Amica 43x38cm at the time because it did not fit in the intended Tiba cooker. I took it very carefully out of the plastic, compared the dimensions and brought it back to Galaxus in its original packaging, and it was taken back without any problems - Many thanks to Galaxus.
Baking trays as spare parts are a problem for the consumer: all dimensions must be correct to the mm, and the edge must not be too thick for the insertion grooves, but also not too thin or hooky, otherwise handling becomes an ordeal.
Attention: if I measure an Electrolux baking tray here, I get 42.5x36cm! (with a knurl thickness of 5mm) - 43x38 is probably not possible (?). I recommend being prepared for a possible return.
With original spare parts, I think you are on the somewhat safer side, and the plates can be stacked afterwards, sometimes a limitless price comparison of these brings surprises to light.
PS: Elektrolux does not even state the mass of the baking tray in the operating instructions for the EB GL4SN, and not even the order number - no laurels for this company.