Dear Marto and fello monks,
I am sorry not providing enough details.
'compare documents-> page by page visual compare' option. Provides
1) Differences in Text
2) If the spacing between lines is different then it is reported.
3) The gutter spaces and all kinds of spacing which we call 'Layout' is checked.
Although this is reported in GUI format (with colors). I wanted a module which can atleast tell me line numbers of PDFs, where the difference is observed.
Thanks for your suggetions.

In reply to Re^4: Comparing PDF files by sanPerl
in thread Comparing PDF files by sanPerl

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