Android : Why I am not geting same Facebook Ids for same account of my app(Android) and website (PHP)?

I am having issue while fetching Fb Id from Graph Search 2.0 API .

For the same account I am getting two different fb Id. I want to have a single ID, from android App and website (PHP).

Android : 100003767313938 PHP web : 491515637650676

I need to make both same. Please suggest , How can I get both same fb id ?