Reduced calories mars, twix and snickers bars

While I was at Asda, I spotted these reduced calories mars, twix and snickers bars.
I expect them to be equivalent to eating 2 or 2.5 portions from the Celebrations assortment.
At the moment, they are only 25p each at ASDA.

Since the twix one is basically the same size as the regular twix, I think it tastes the same as the regular twix but the mars and snickers are the probably the same as the ones in the celebration box.