It is possible that IRCC looks at old files for discrepancies. It might be a problem because you fudged your application, not because it is NOC A. I realize to you it was just "simplifying" but IRCC might view it as worse than lazy.
If you changed positions/job duties, that is considered a different job, and you would have to list them separately and document both positions. If you had an open work permit at the time, the change would have been authorized. But if you had a closed work permit, you would have needed to get a new work permit (if you didn´t, then you have a different and bigger problem on your hands).
The fact that you didn´t declare both positions - it might not be caught, and even if it is, as fudging goes, it may be seen as minor. But this will all depend on the VO. If this is one of many red flags, they might get cranky about it. If the rest of your application is good, they might let it slide.
BTW - why did you dredge up such an old thread (from 2014), instead of starting a new one?