I'm just curious why you think that will get a correct answer?
As a matter of fact, I bet he DID call his distributor and they are the ones who told him it is a different cable.
While we have an installer in this thread, that has actually worked with a 2020 model and has a 2019 cable - said it works. Unless he is running a high fever, drunk, or something else.

Considering how absolutely clueless most of the employees at distributors tend to be; I would bet my money on IRkiller.