There's more to it than just the threading. The thickness of the cap and length of the tube come into play as well. For instance, if your Nemesis cap extends 1/4 inch farther into your tube than the Sentinel cap did then your battery may not fit inside. Alternatively, if your Sentinel cap extended 1/4 inch farther into your tube than the Nemesis cap does your battery will not make contact on both ends.
As far as CAN it work, there is no harm in trying it. As long as the threads are the same then in theory it can work. In practice though, it depends on how far each cap extends into the tube. If they are both the same then it should work just fine. If one cap extends farther than the other you may run into problems.