Didn't notice till you pointed it out. I actually think it's the studio version until after the first "you're still waiting for that snow to fall." Maybe he massively cocked up the piano during the recording and they only realized after? Who knows. The piano is noticeably brighter and less precisely-played after that point.
Everything else about this version is very good though! Will has some good singing that's mixed very well, Jonny's guitar really shines during the instrumental break in the 2nd half!