Practicing Organizational psychologist often are seen in the Human Resource departments of manufacturing plants or larger cooperation's, where as a research OP is actually a party that participates in research. For example you maybe involved in a research (think tank if you will) that provides a research on the environment of a work place. The typical researcher writes research paper and is normally funded by either private cooperation's or federal government grants.

Hi Celina, at least in my country (Colombia) is unusual that the organizational psychologist doing research, mostly engaged in applied work, mainly in recruitment processes and training

There is, in OP, borrowed from Clinical Psychology, the popular notion of the 'scientist practitioner'. It aims that assessments interventions are evidenced based. It tends to underestimate the importance of  competence in complex real world scenarios which are often found in organisations. There's an account here.

http://en.wikipedia.org/wiki/Scientist%E2%80%93practitioner_model

Probably all practitioners need to be research aware and all academics need to have practical competence.

Its an ongoing topic!

Best wishes

Donald