In my case they repaired it first with exactly the same Top Case model (2016 MBP with Touch Bar), but the problem appeared again a few months later and replaced the Top Cass again but with the 2017 model.Did they replace it with a generation 2 mechanism keyboard? Or do they just replace the generation 1 keyboard?
Didn’t have the problem again for almost 1 year, but it’s sporadically appearing again so this repair program might be useful to me. I plan to replace the MBP earlier than 4 years anyway.
If you mean whether they can replace it with even older pre-faulty butterfly keyboards, I don’t think it’s possible.