Tesco instant noodles half the cals of Sainsburys. Can't be

I've phoned Tesco customer services and they insist its correct. The main difference that I can see is that Tesco list the calories for the product as made up - the full packet should make 265g of finished product. Sainsbury list the calories per 1/2 pack but don't say if that's dry or made up. I guess I'll be sticking to Tescos noodles in future but I don't entirely trust that calorie count.

Sainsbury list the calories per 1/2 pack but don't say if that's dry or made up.

Surely a half pack is a half pack whether dry or made up?

Serving size is a killer on a lot of pre-prepared food. I used to eat instant noodles a lot thinking they were a relatively low-calorie option. Not only is that not the case, they're also full of junk.

yes I don't see that it would make any difference either. I know they're not the healthiest but they're cheap and quick and I'm on a very tight budget!