DE-Metropolis-Z algorithm

I am trying to look for the reference paper (if there is any) which talks about DE-Metropolis-Z algorithm. I want to understand how DE-Metropolis is different from DE-Metropolis-Z - both, in theory and in implementation.

The only details that I can find about DE-Metropolis-Z is from this page - https://github.com/pymc-devs/pymc3/pull/3784.

@michaelosthege could you provide some pointers?

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