No idea. Ohlins forks off the RSV are 51mm external diameter in the yokes I think, and they taper outwards nearer the wheel spindle. Not sure what the dimensions of the 916 yokes are?
No they don't fit, not unless you get someone like Harris to sort you out a set of yokes with the stem for a Ducati mated to yokes for the Aprilia, I know because I had a set of Ohlins from a RSV and measured them up and as there wasn't a sensible way to get them to fit the 916 yokes I asked Steve Harris. So I sold the RSV forks and picked up a set of 748R Ohlins for £100 more, works out a lot cheaper than getting a set of billet yokes made.