The KD driver is a single li-ion driver and the Match mini mag is a 2x14500 or 2xAA setup. Either way, the voltage won't match.
The other problem is heat. Quoting Match's mod thread, "There is sufficient surface contact between the pill/head that there are no thermal concerns as long as output remains at 2xAA power levels." The best 2xAA drivers push about 1A. 3A could be too much.
Triple for a Mini mag probably isn't the best option unless you can make a custom pill like Match does for his Mini mag triples.