That is the first time I have seen those sachets and it provides a missing link as far as I am concerned - ie that Honda's M77 is the Molykote product made by Dow Corning.
The only reference that I have found for M77 replacing M60 that has stated the purpose has been for use on car brakes.
I know that Honda use M77 on brakes. I have never seen a statement that M77 is a suitable replacement for M60 on drive splines - only in the context of car brakes - and yes - I did some thorough searching at the time.
That package confirms that Honda use the Dow Corning M77 'Molykote' paste for brakes - which until now, I could only assume.
The spec sheet for Dow Corning Molykote M77 states that it is not suitable for extreme load applications.
It also uses a silicone base, and Dow Corning have stated that these are typically not suited to the extreme load situations, that I described to them for the St1300 drive splines - mineral base is preferable. (In an email reply to my questions that I published on here years ago).
Dow Corning no longer list the recommended G-n paste which was suitable for extreme loads, nor do they list M77. The company now seems to be focusing on Silicone based products.
The Japanese company Polysi produced an M77 paste for Honda which was also silicone based.
Other products recommended in the Honda manual for the drive splines still exist.
Rocol ASP is one of these. This has since been renamed by Rocol as Dry Moly Paste, but it is the same stuff - according to email from Rocol They quoted 50% MoS2.
The things to look for are
MoS2 content >40% - according to the manual
Suitable for extreme pressure / load situations - according to Dow Corning
Many use Loctite 8012 / 51048 which seem to meet the important spec for use on the splines and has good reports from members of this site.
I use the Rocol Dry Moly Paste. It's easier for me to get hold of. It has the look and feel of Moly60 in spite of having quoted different NLGI rating - a broad brush scale which compares the consistency of the paste with things like peanut butter, vegetable shortening, and tomato paste! Both feel more like Peanut butter (2) to me. Definitely not 'hard shortening' or solid fat.