I did my MCC on a jet FNPTII. The MCC course did NOT give me a JOC certificate. I had to do that separately (a bundled deal at the time; good price).
I thought the JOC was a bit meh. I am not convinced that it taught me much. It was to do with further planning ahead due to increased speeds, stability at high altitudes, yaw damper vs no yaw damper, oscillations that sort of thing. It was useful but I don't believe it's something that should be required prior to a job. If they think that stuff is so important they can add an extra day on the TR and do it then.
I would suggest that if you have a piece of paper which specifically states that you have completed a Jet Orientation Course then you meet reqs to apply, otherwise you don't. I am not aware of any MCC providers giving you a cert for it just because the MCC was done in a jet sim, because the JOC has little/nothing to do with multi crew, more to do about your personal knowledge and experience of jets.