What is the difference between FoodWatch registration and food product registration?

FoodWatch is the establishment side: Dubai Municipality’s Food Safety and Nutrition Information Management Platform, on which the food establishment is registered and through which its Person in Charge manages permits and food-safety records. Food product registration is the product side: the Municipality’s Apply to Register and Assess a Food Item service — Food Item Registration and Food Label Assessment — used where food is imported or re-exported, and applied item by item. One is about the premises and the people; the other is about each product. They are separate services with separate requirements, and GGB prepares each on its own terms.

From FoodWatch & Food Product Registration — the full reading, with the method behind this answer.