The difference is the dimensions of the part to be locked.
As the difference is only 0.3mm, they are interchangeable.However, 60 contact are not compatible.
The difference is the gold plating thickness at the contact area.
PCN10-96P-2.54DS(71) : 0.1μm
PCN10-96P-2.54DS(72) : 0.2μm
PCN10-96P-2.54DS(77) : 0.76μm
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In cases where the application will demand a high level of reliability, such as automotive, please contact a company representative for further information.