Sounds like companies here that only wants to sale new stuff. either that or they are just too lazy to look-up the product.
As for the element provide you have found the right part number it is a simple change out as it is just two wires. You should not even need pull the oven out to do this. Now of course I don't this oven physical setup, just going what I see here in the US.
The wiring diagrams just indicate that the input power source can three phase and two phase 415 vac or 240 single phase power. I would think residential wiring will be the single phase 240 vac or at least that is what most home in the US are wired for expect we do have 240/120 vac single phase circuits.
