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 plating on the contact area.
PCN13-50S-2.54DS(71) : 2μm tin copper over 1μm nickel
PCN13-50S-2.54DS(81) : 2μm tin over 1μm nickel
PCN13-50S-2.54DS(71) is...
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