what is normal air filters for tata safari dicar 3L and is there a K&N replacment filter for the same?

Answer 1

Call the dealer. Unless you have a part number off your filter. I could interchange it for you. K&N filters are crap, by the way. What year is the vehilcle? 2005?

Answer 2

Why do you want a K&N air filter? I'd recommend that since you are driving a high-tech common rail engine, stick to the original recommendations, unless you are also willing to tweak the engine management software.
You should look for 'kits' that re-do the entire intake train, including the turbo if you want better performance.