IS300 vs MK4

[Isphius]

I was thinking about getting a mk4 supra turbo, but i can only spend about 20k total on the car, and I cant find a mk4 turbo for that much. But i know the is300 has the 2j motor, And i can probably afford one of those. Now my question is, What is the difference between the is300 and supra, as far as engines go. And will the turbo parts from the supra bolt onto the lexus? It looks like the lexus has the older style manifold that goes out the side of the motor instead of the front, But does that matter? also let me know if there was a thread on this already, But i couldnt seem to find any.