Please see below, the difference is the package tube style.
Parker Chomerics THERM-A-GAP™ GEL 30
65-00-GEL30-0030
Description: GEL30, 1 30CC CART., 27CC FILL
65-02-GEL30-0030
Description: GEL30, 2 30CC EFD, 27CC FILL
Resource- Parker Chomerics Thermal Interface Thermal Gels.pdf