As others have indictaed this was only a labelling chage to the arrows. On another of your posts you indicated they were protours. Ensure they are labelled protours and not just x-10.
There is a larger difference between the X10 and the x10 protour. X10 are tapered at both ends and were designed for recurve shooters. The x10 Protour was specifically designed for compounds and only taper toward the point of the arrow.