Okay, the bolt pattern for the 951 & 944 disc/hub are the same so yes it will bolt up. However, the 951 disc is thicker than the 944 and the 944 hub is thicker than the 951. I take this that the 944 thicker hub together with the 951 thicker disc would be too thick for the spindle offset to allow the caliper to be centered over the disc, that is if it would all bolt together in the first place. In short, it doesn't look like it would work.

944 = 944 NA
951 = 944 Turbo