Need a spare key. Can I buy any valeo citroen Key

[Moe]

Dear all

I need a spare key and am thinking of buying one on ebay that is similar to mine.

I have noticed the keys have different part numbers. I only have one key for my car and I opened the shell
and found the part number on the circuit board (73373067C).

I am thinking of buying a used key (ebay) and swap the circuit boards (using blade from the one key I have) reprogram or resynchronize the ebay key. If it works (unlocks and locks doors) then buy a spare blade (with shell) and have it cut. then swap the circuit boards over again.

Idea is to test and reprogram circuit board first and then have a spare blade cut.

Has anyone tried this?

Would this work?

I am worried about the part numbers and which used keys will have circuit boards that are compatible with mine.

My car is :
Citroen C3 SX HDI 70 5dr Dsl Auto 1398cc