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The M235 and M2 share crank part numbers. The other N55's have a different number and there is no note in realoem that the number has been superceded.
All N55s have the same forged rods as the S55 if it makes you sleep better at night.
No N55s, N54s, or S55s have forged pistons. They're all hyperutetic. It's very rare that factory motors have forged pistons due to emissions requirements, long term reliability, and NVH goals.
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