The difference is packaging and tape for vacuum.
Part number : Packaging / Tape for vacuum
FX6-**P-0.8SV1(71) : Tube(Magazine,stick) / Without tape
FX6-**P-0.8SV1(89) : Emboss tape / With tape
FX6-**S-0.8SV2(71) : Tube(Magazine,stick) / Without tape
FX6-**S-0.8SV2(89) : Emboss tape / With tape
** stands for number of contact.