Clotted cream conundrum

Here's a puzzler for you: what's the difference between Sainsbury's clotted cream, Tesco's clotted cream, and Rodda's clotted cream?

All three are made by the same company (Rodda's, in Cornwall), look the same, and are supplied in exactly the same quantities and packaging. Yet on all of them the nutritional information is different. How does that work?