This is because the mount points for the screws are different:
It's unclear exactly why you want a higher airflow in your machine, however I suspect you want to cool the machine down quicker/more efficiently, in order to fix temperature issues. Even if a higher CFM fan did exist for your model, it is unlikely that it would be supported in your model's revision as higher CFM fans will use more power (that the specific revision of the model might not be able to provide).
Therefore to (partially) fix your temperature issues a laptop cooling pad may be better suited for your situation, as:
- It has its own fans built-in that attach to a USB port of your machine;
- They are relatively inexpensive;
- It may last longer than the life of your current machine (you may be able to use it for your next laptop)