With respect to structure there is not so much difference whereas difference occurs in power and autonomy. In Musharaf Dictatorship Zila Nazim was most powerful post, even DCO's ACR was sactioned by zila nazim. Musharaf brought bureaucracy under control of his selected politicians as 90% of Zila nazims were his cronies.
However, structure of local government under present system is described as follows:
(a) in urban area -
(i) a Union Committee for each ward in the Corporation;
(ii) a Town Committee for each Town comprising of Union
Committees
(iii) a Municipal Committee for each Municipality comprising
of Union Committees as prescribed by the Government;
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(iv) a Municipal Corporation for each City comprising of
Union Committees as prescribed by the Government;
(v) a District Municipal Corporation for each district of the
Metropolitan city; and
(vi) a Metropolitan Corporation for each Metropolitan city;
(b) in rural area -
(i) a Union Council for each Union; and
(ii) a District Council for each District;