Freezer rooms can store products at low temperatures. This means that products can be kept at between -18°C and -40°C. If you want to store things for months or even years, then a freezer room is ideal. Cold rooms are nowhere near as cold. They tend to operate between two temperature ranges.
A cold room is a type of insulated, refrigerated space that is designed to maintain a set temperature. They're used in professional kitchens to store food, as they can hold a lot of stock and can vary in size from a small walk in room to a larger warehouse.