ive had mintolas, mint munchies and after eight bite size in my time and i can say the only thing thats changed about them is the name.
Regular munchies in the red pack were the only ones that had biscuit (and caramel) inside.
product info - Nestle Rowntree has moved its Mint Munchies brand into the After Eight stable and relaunched it as After Eight Bitesize.
According to trade communications manager Graham Walker, After Eight has always been ideal for formal sharing occasions but has recently moved into more informal usage thus the bitesize option. The sticks will be available from the end of October and will retail at 51p.