I can't answer the question with any degree of certainty, but I know a man who can: take a look at Mike Snook's 'Iron Duke' website where you'll find plenty of information, and if you don't find what you need to know there, pop over to the Victorian Wars Forum, where I'm sure I remember a thread discussing exactly this question - what units were equipped with what type of firearm during the Mutiny.
Hope these leads help!
Simon