Even though I am trying to simulation results when i compare two papers it is going some where.So can take already existing two simulation results and explain them.
Your question is a bit vague but I believe you intend to know if it' possible to publish a paper comparing two methodologies or two different results (that are somehow connected). Yes it is, although the quality of the paper matters a lot.
Every once and a while there are many ideas out there and a study is needed to understand what are the comparable advantages and disadvantages. This studies are important because it gives the opportunity of fellow scientists to focus on tasks other than selecting some method from a pool of "n".
That being said, that paper will only be important if it presents relevant information that will allow some scientific or knowledge advancement. If the idea is to write a "comparison" paper just because it seems faster than it's likely that it will be largely ignored.
The comparative study is usually very useful and makes the researcher takes good experience. Suppose you compare the performance for solving a problem using several approaches. That might leads to modify one of them or you propose a hybrid approach from two of them expecting that might enhance the performance.