I may be completely wrong here, but you don't know if you don't try.
Was in tiny local Asian shop today scouring the shelves for just "something". Been meaning to try Kashmir mix/powder as it has been mentioned a few times here, but was put off by the price. Was about to buy it anyway (?4.50 for a decent size bag and no smaller ones available) when I spotted two shelves away some "Basar Mix" - it rang a bell and closer inspection of the back of the bag shows "Basar Mix (Kashmir)". Looked like the other one colour wise and ingredient list was identical, but only ?1.50 for same size bag.
Only problem is, neither give the proportions of spices, so could well be completely different.
Probably too good to be true but it's always handy to have another tool in your weaponary!