Is that in your new MBP? If so, no reason that it wouldn't fit in older, like the 2016? I have gotten so insecure about this stuff, not paying much attention the last few years.
It's the external one. My internal SSD drive is whatever Apple put in there. I don't think you can change the SSD in a MacBook anymore.
CompuServe: I had two numbers. The one I used last was 100770,1601.