The most obvious difference is the displacement. The 3.3L engine has a displacement of 201 cubic inches, while the 3.5L engine has a displacement of 215 cubic inches. This difference in displacement means that the two engines have different bore and stroke dimensions. The 3.3L engine has a bore of 3.65 inches and a stroke of 3.35 inches, while the 3.5L engine has a bore of 3.80 inches and a stroke of 3.20 inches.
The difference in bore and stroke dimensions also means that the two engines have different cylinder heads. The 3.3L engine has a cylinder head that is designed for a smaller bore, while the 3.5L engine has a cylinder head that is designed for a larger bore. This difference in cylinder head design would make it difficult to swap the two engines without also swapping the cylinder heads.
There are also differences in the intake and exhaust manifolds, the fuel injection system, and the engine management system between the two engines. This would make it difficult to properly install and operate the 3.3L engine in the 1998 Intrepid.
In conclusion, the 3.3L engine from a 1995 Intrepid is not a direct interchange for the 3.5L engine in a 1998 Intrepid. The differences between the two engines are significant enough that the swap would be difficult, if not impossible.
