Is Residential address same as mailing address?

[welldone]

Hi
I have question on form IMM008ENU_2D. My cousin husband which is the applicant live in Afghanistan his wife is submitting his sponsorship application. There is no proper mailing address system in Afghanistan his house has no number I just put his street or the area where he live and the city and province. There he can rent a P.O.BOX but some one told me CIC Islamabad will not return his passport to p.o.box. Now what should I put in this question (1) Is Residential address same as mailing address? Can he give our relative address in Peshawar Pakistan his mailing address will he need a to complete representative form for this as he using that address?

My second question is there are two same forms IMM008ENU_2D and IMM008DENU do I have to complete both. In check list form they asked for IMM008.

Thanks