To be honest, none of the reproduction seats I have seen match the original shape and profile. They are close, but if you're looking for an absolute carbon copy in terms of foam shape, correct vinyl grain, seam and stud location....that is gonna be tough. I have used the K0 CHP honda seat and I was definitely impressed with the craftsmanship and quality, but definitely not identical to the originals. I will say the foam is much firmer than a nice original K0 seat too. I think for the money it might be the best option. Just my personal preference and opinion.
The pics of the seat on the red bike are an original pan and foam with a new cover from Phatmx.com that I restored, and the seat on the blue bike is a complete CHP seat assembly.....notice the location of the rear seat stud, it should be in front of the vertical seam. And the CHP seat is slightly flatter at the rear. Also, every reproduction seat cover I've seen has a stitched vertical seam, which is only correct for early silver tag CT70's. Later on in production the seat has a heat pressed vertcal seam, like yours.