After many hours of reading all I have found so far, it would appear that "Kashmiri Chilli" as we know it is not as described. Kashmiri Chilli, Kashmiri Mirch, Deggi / degi / degchi mirch, or whatever else it may labelled, when you buy Kashmiri Chilli, you are probably not getting chilli that has any connection to Kashmir.
What you are probably buying (and growing) is chilli grown in the Karnakata region and more specifically from Byadgi / Byadagi. It is common practice to name chilli in India by region where they are grown. Chilli grown in the region may not even be all exactly the same.
So I have plants growing at the moment that are from seed from whole dried "Kashmiri" chilli, bought Kashmiri Chilli seed and Byadagi chilli seed (both of which could be anything or probably / possibly the same) and Lal Mirch, which literally translates to Red Chilli. As well, I have Rajah and who knows what it is? In India, it would appear that the variety is of little value. The things that matter are the characteristics.
Have a look at some of the youtube videos of the Byadgi / Byadagi chilli markets. Amazing footage of Indian ladies sitting cross-legged hand cleaning and sorting millions of dried red chillis while men fill hessian sacks by hand, foot and body. The appraisal system of inspection by buyers is quite odd. Handfuls are grabbed, squeezed and thrown around in some sort of ritual to ascertain quality and determine market value.