Im bout to own this car but before I pay off. Can i use grand am parts

What is your question?

Are Pontiac Grand Am or any car parts compatible with the 1994 olds 98 im bout to purchase? A friend said i could just curious. I need to know if somebody has been taking my parts off the car im gonna purchase for inplace of there none working parts? Which cars make modle thank u very much? Seems like parts have been changed out.