They may have udated to Turbo spindles that allow the use of Turbo struts and larger brake calipers (as I have as well). I didn't even go deep into that upgrade because I am not sure how much $$ you want to spend. That $50 purchase could easily snowball into a lot more cash. It sounds like you were really interested because it seemed like a deal.
I don't have any personal experience with Tokico, but I do with Koni. Many people on the board here are Koni users. The Yellow Konis for both the 951 struts and 944n/a struts are very similar. The diameter of the cylinders of the struts are different, as the 951 struts are much larger and "beefier" with thicker metal at the area the strut contacts the spindle as well.
Hope that helps!
Tifo