Chosen Solution

Anyone know if the 2017’s SSD will work in the 2016?

If you have a mid 2017 function keys model and a late 2016 function keys model the SSD should be interchangeable. MacBook Pro 13" Retina (Function Keys, Late 2016-2017) SSD

You’ll need to wait until IFIXIT has had a chance to open one up to see what Apple has setup.