Can a method of research used in one context be reused in a different research context?
Yes, it is possible - it happens a lot. Epidemiological methods that originated in health have been applied to other fields, for example.

Doing it is easy.

Doing it rigorously, in keeping with the standards expected in academia, is really hard. It's hard because the source field's methodology usually has a lot of tacit assumptions built in. Identifying those, and testing they're applicable to the application field, is difficult. Lazy researchers don't bother doing that testing, and produce shoddy work as a result.