As suggested above, just write Letter of Explanation just saying that you feel the job duties are more matched with another NOC in same category and you ll be fine.
CIC in ANY case will calculate your CRS and what matters is that your score should not be below the cut off for that draw. May folks make big changes like removing Job Experience for which they are not claiming any CRS points and they get PR ! I myself removed spouse job experience after getting ITA, i just write this in LOE and i got PPR just this week !