Specifically, both of these Loctite products are part of the same group, that being blue Loctite. Loctite products come in four color codings: blue, green ... 242 and 243 cure in the same period ...

Green Loctite has a fairly low viscosity, so as long as there's a little gap you can stick the tip of the bottle into, it can flow into even the tightest of threads and cure. It's also good for ...