You need to follow the semiconductor business closer.
Seriously, consider the ramifications of producing a chip that goes into the same phone at two different foundries. There are very good reasons why you've never seen that happen. (Although Samsung has put different chips into the same phone for different markets).
Fact of the matter is that Samsung is producing at 14nm FF as we speak.
Rory Read, then CEO at AMD, in 2014 stated at Deutsche bank that AMD would move their new lines of products to FinFet in 2016. Also, at the AMD core innovation summit in 2014, it was stated that the K12 (their new ARM core) targeted 14nmFF. So I'd say that the likelyhood that an AMD device contracted at the end of 2014, and produced after AMDs new products will use the same process is rather high. In fact, I would assume that if Nintendo has indeed made that order from AMD, then in all likelyhood whatever they ordered is based on something that AMD had cooking under any circumstances.
Lower cost, lower risk.