Are gt parts interchangable with a se

well if it is the same make and it is not an engine part usualy the SEE EX XLT stuff stands for engine size like my EX town and country van has a 3.8Liter engine in it but the LX has a 3.8 Liter engine

Most parts will, some will not. What sort of parts do you want to swap? I believe even engine and transmissions will be the same as long as they are the same engine, ie. 3.8, 3.1, or whatever was offered back then and out of the same year of car. If it is a major part like engine or transmission do a bit more research to be sure. Sometimes a friendly auto wrecker can give you some guidance on interchangeability.

I have a 2000 Pontiac Grand Prix GT that has a blown engine. I'm thinking about putting a GTP motor into the car. Is the supercharged engine interchangeable with the GT?

As long as you're not planning on using the supercharger you should be OK although further research is required, I can't say for sure. Adding a supercharger to a non supercharged car however is a huge job and really not worth the effort considering there are lots of supercharged ones around for cheap.

I have a 2003 grand prix gt and a 2003 grand prix se. And I had to change the radiator. The gt radiator did not match the lines on the se. So the radiator does not interchange. I took all the wiring and the coil pack and put them on the se and they worked.