Mr Kipling’s Country Slices

This isn’t really a meal as such, but it is food-related, and a general wondering of mine.
How come that ‘Mr Kipling’s Country Slices, baked with currants and sultanas’ are suitable for vegetarians, BUT ‘Mr Kipling’s Manor House’ cake, (which is exactly the same as the slices but in one large cake, as far as I can see) isn’t.

Actually, WHY isn’t really the right question. I know WHY.
‘Manor House’ has animal fat in it, but ‘Country Slices’ don’t. Very odd.

Talking to my sister (along with my girlfriend, also a vegetarian), I’ve discovered things like this before. Fizzy cola bottle sweets have gelatin in. BUT fizzy cola-flavoured laces (the same product, different shape) don’t.

Sometimes I wonder what the manufacturers are thinking when they make these things. I might write to Mr Kipling about the cakes and ask him.