DDEC coolant level modules

[Iceni John]

Why are there so many different coolant level modules for DDEC?   My bus has a 23503507, but on eBay I only ever see others with different numbers.   (There's even a DDEC II / III "Collant Level Adapter" now on eBay, needless to say with a different number!)   What would happen if I use one with a different number?   Do different modules have to match specific sensors, like gauges have to be matched with their correct senders?

Thanks, John