My MBP is late 2016, and just a few weeks ago they replaced my butterfly "second-gen v1" keyboard with the "second-gen v2" keyboard.

The tactile touch is noticeably different (more "rubbery") and some of the modifier keys (ctrl/opt) look different. It definitely feels like a welcome upgrade.

I believe the newest, 'more resilient' one. Don't know how to check for sure though. I have a 2018 model.