This the general idea? The former would seem to me to be imperfective, the latter perfective.
Think of it this way, there are regular imperfective verbs and then there are super-imperfective verbs. iść is regular imperfective and chodzić is super-imperfective. Most of the time the distinction isn't possible or isn't important but when it is.... it is.
There is no similar sub-division of perfective verbs that I'm aware of.