2001 Sonata 4-cyl Engine Swap

Does anyone know what year motors fit a 2001 Sonata 2.4L 4-cylinder? I have read a 1999-2001 will fit as well as a 1999-2001 Kia Optima 2.4. I also read somewhere else that a 2001-2004 2.4 will fit in a Kia Optima. Would this also mean that a 2001-2004 Kia Optima engine will fit in my Sonata? I am also wondering what the difference is in later model year 2.4L 4-cylinders in Hyundai Sonatas (2002+). I just don't want to buy an engine that will not work with my car. Thanks!