Zomaxiee

I want to use Final Fantasy IV Advance tiles for the fan game I am making but there is an obvious size difference between those and RMXP tiles. My question is how do I use the FFIVA tiles in it? I ask this because I know Bwd is using normal Fire Emblem tiles for his FE games he is making in this program so I figured it must be possible. And in case you are misinterpreting what I am saying, I am not ask how to import stuff into the database. Nevermind.