Head heights changed, because DIN 7 had rounded ends, whereas ISO 2338 has flat ends – giving it our “mostly interchangeable” status.Nominal lengths were redefined meaning that the measurement points for lengths have changed.Note that the pin itself is still considered unhardened, it’s just that the range for acceptable hardness was clarified at 125HV to 245HV for steel and 210 HV to 280HV for stainless steel.Lastly, the hardnesses for steel and stainless steel were defined. Essentially, they are interchangeable with very few exceptions, exceptions existing only if the difference in head affects the application, but it is expected that very few applications of this fastener would be affected by the difference in head, so I would say they are “mostly interchangeable”.How limited the interchangeability is, is not noted in the resource.This is mostly why they are considered to have limited interchangeability.The DIN 7 had rounded ends, whereas ISO 2338 has flat ends.
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