Whether or not your NOC changes it doesn't matter - a change to tittle/duties and certainly being granted managerial duties automatically triggers the requirement for you to disclose of a change to your working conditions to the province.
You would have applied for PNP under a NOC. You're entitled to keep working as you're on an IEC open work permit - so what you can do has no restrictions, however, that nomination certificate would have been linked to 1 NOC.
So: you'll need to notify your PNP office and submit details of your new role, and obtain a revised nomination to transmit to IRCC. If you don't do this, you'll be in trouble later.
This is exactly the reason I refused a promotion until my PR was clear.