To that I would say there are several “I'll try not to bog you down in the quagmire of technical details on packaging” kinds of packaging changes. They're what we call single plate changes, where you need to change an ingredient because it's no longer available or you've chosen to use another ingredient. That's one type of change, and it's very inexpensive, very quick, and happens relatively frequently.
Any time you're trying to redesign the real estate of your package and you want to move things around on it, this usually requires getting a packaging and design firm and relaying that entire package. This would be a second and much more expensive level of change.
Then regarding the point raised by Health Canada, if that's also required by supported nutritional analysis, it has third-party validations, and it's sent out to labs, that is yet another layer.
So not all changes are created equal is the message I would leave with you, and the more space and more analysis you require, the more costs you incur.