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.