There are adapters for M.2 (NVMe SSDs) to 12+16 pin (apple's connector). Just check that you get the right adapter, and you could plug in those blazing fast (and not so expensive) SSDs into your Mac.
https://www.amazon.com/Cablecc-16pin-Macbook-M-Key-Convert/dp/B073GVNPR2/ref=sr_1_2?ie=UTF8&qid=1530136610&sr=8-2&keywords=12%2B16+pin+ssd+adapter
https://www.amazon.com/Samsung-970-EVO-500GB-MZ-V7E500BW/dp/B07BN4NJ2J/ref=sr_1_2?s=electronics&ie=UTF8&qid=1530136709&sr=1-2&keywords=970+evo+m.2