Hi Subhasri,
Many of the people dont know the meaning of Internal audit and statutory audit. I will clarify it.
Internal audit is an audit which a compay(Who is coverd by CARO i.e. Companies Auditor report order) has to get it done from from a chartered accountant, its mainly in relation to internal control prevailing in the organisation. It is as good as regular audit. It is good to have control in the organisation. Further, statutory auditor will rely the internal audit for the purpose of their statutory audit.
Statutory audit is an audit to comply with the statues, which is mainly Companies Act, 1961 and Income tax Act, 1961. While doing Statutory audit one needs to follow the provisions of the statute, like Schedule VI in companies Act and all the other provisions of the companies Act. In relation to Income tax it is Form No.3CD etc. There is specific format is there for statuory audit but for internal audit there is not format is there for report.
I think above information will suffice your requirements. If you need any further information than you can contact me on my email which is

or you can give me a call on mobile which is 09987389930.
Thanks
Ajit