The key will work with any copy of the XP Pro CD provided it is the same as the one you had, I think the difficulty will be in finding a copy. There were plenty around at one time - the trial versions as I remember.
Was yours full or OEM?
Surface Pro 5 News - release date, UK price, features, specs
Gear VR vs. Daydream: Which delivers the best VR experience?
iPad Pro 12.9 vs Surface Pro 5