GEN 2 Will 2018 Key Fob work on 2017?

I bought an extra key from eBay that is advertised to work on my 2017 or 2018 model; however, I've tried everything I can find online or elsewhere to program it and no luck. I asked the guys at my local dealer and the Parts guy says it won't work coz the one I have is for the 2018 model.

Anyone have experience with this? Thanks

There’s another 2018 key fob thread in Gen2 general; reprogramming sequence is in that thread.