Nothing really big, if you're talking the late model 318i/is. If you get a 325, you can save a little bit of money by not having to swap out the differential and driveshaft.
Both cars have the same front and rear brakes, axle shafts, suspension parts, subframes, etc. as long as you're looking at the late model cars. The early 318i (84-85) is a fair bit different underneath.
318 vs 325 for an s50 swap
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