Great reasearch! Thats good to know that it will work because they looked different and like you said everyone said that the Kodiak and Big Bear were different. I thought it was Odd that the Big Bear 400 was the only model that didnt have an aftermarket CDI available.
What was the problem with the coils, no spark or weak spark, if you have a good blue spark your coils should be Ok you may have to look at it at night to check that out. I would then try adjusting the mixture on the carb they arent always perfect.