The difference is key of insulator.
HIF3FCA-50PA-2.54DS(71) can mate with both HIF3BB-50D-2.54R(63) (one central convex key) and HIF3BA-50D-2.54R(63) (two convex keys).
HIF3FC-50PA-2.54DS(71) can mate with HIF3BB-50D-2.54R(63) (one central convex key) but can not mate with HIF3BA-50D-2.54R(63) (two convex keys).
HIF3FCA-50PA-2.54DS(71) can mate with both HIF3BB-50D-2.54R(63) (one central convex key) and HIF3BA-50D-2.54R(63) (two convex keys).
HIF3FC-50PA-2.54DS(71) can mate with HIF3BB-50D-2.54R(63) (one central convex key) but can not mate with HIF3BA-50D-2.54R(63) (two convex keys).
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