Sour Cream & Chive will replace Salt & Vinegar, while Simply Salted is a lower salt version of Ready Salted.
The range contains a third less fat than Walkers' regular crisps.
Trade marketing manager Cara Beeby said the new variants would appeal to target consumers of women aged over 50, who preferred lighter flavours.
The new packaging features an image of the crisps themselves and GDA labelling, bringing the sub-brand into line with the standard Walkers range, relaunched at the beginning of the year.
The company estimated that more than 70% of people were actively avoiding the consumption of saturated fat and said that the better-for-you category was already worth more than £100m.