its not about the jangla bus. its about the allocation of resources. what one should compare is not the project vs. project but the amount of resources allocated towards a certain project (in this case metro bus). As per the article, KPK has allocated 14bn towards a project of similar nature while
punjab spent 30bn to achieve the same.
it can very well be argued that the size of Lahore is too big compared to Peshawar thus the project cost of 30bn is somewhat justified.
a more equitable comparison will be to look at the per km cost which is being incurred by the two provincial govts. According to this parameter, Punjab spent 1.10bn per km. The KPK metro project will be 26.6km long which gives the per km cost of 0.53bn. One can therefore say that the KPK is trying to achieve the same objective at half the cost of Punjab.
another issue is that 14bn allocated by KPK is planned expenditure. It might go up latter. Also the quality of the project might be different across the two provinces. but that brings up the question: how good a quality do you want in a country like Pakistan? The answer may vary from province to province.