Hi.
In addition to the differences in size, color, and pattern, Jampea retics have other differences from P. reticulatus reticulatus according to Auliya, Mausfeld, Schmitz, and Bohme 2002.
P. reticulatus jampeanus -
Ventral Scale Counts: 290 - 301
Midbody Scales: 64 - 68
Distinctly enlarged anterior prefrontals and one row of posterior prefrontals
P. reticulatus reticulatus -
Ventral Scale Counts: 304 - 325
Midbody Scales: 68 - 78
Anterior prefrontals just slightly longer than wide and two rows of posterior prefrontals
It's easy to understand your doubts since all that anybody talks about is the size difference. But when we get down to the scales it's a whole 'nother ballgame.
Bill