Physically 2M styli will fit on alternative 2M cartridges bodies, but 2M Series cartridges’ engines, coils and magnets configurations are not quite identical:
Red and Blue are identical, so are the Bronze and Black.
2M styli interchangeability
The Stylus 2M Red is recommended for following cartridges:
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2M Red
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2MR Red
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2M Red Premounted