Can you get the stainless steel band for the nike version?

No you can not, but you can order it separate and either keep the band that came on the Nike Version or sell it on eBay. https://www.apple.com/shop/product/MJ5J2ZM/A/42mm-link-bracelet?fnode=ab4f555b4288cf0bc492d18eaae90537eb411490a1e3cce5cfd412d04dff41b2022854e21216132899d9b89dab14e47bb67a0e20401bce40126b10cde412beb8dbe6a6381575c4364118a2163a811402

The stainless steel band is available in 42mm Size which also fits the 44mm new Series 4 Apple Watch. I have had mine since the first version and can tell you it is a wonderful band, a bit expensive but works well. It does show scratches and 'weathers' to a very nice patina. I do change back to the sport band or Nike sport band now and again when doing a workout at the gym. It is very very well made.

Fancied one for mine Apple 4 Nike and the saw the price!! I have the Milanese loop in black fantasy. But expensive. Ta.