Take stock head sizes only as a broad guide.
For example, I measured and compared my 4D 200 Tours and PSGTs, both unstrung. The hieght and width of the frames is the same. The PSGTs simoly have a lttle more space in the bottom "corners" and play like a more forgiving version of the 95" 200s.
Instead of thinking of 95" vs 98" think...
Pure Storm GT mod: 337g, 8.5 HL, SW 328
VS Touch Black/Focus Hex 1.23 @ 58/54