This will be confusing to discuss...
From what I've seen, while looking at JIS screwdriver sets, the standards have changed once again. JIS screwdrivers might not be marked or sold any longer as JIS. The JIS (Japanese Industrial Standard) for them was discontinued, due to newer production methods that supposedly work for all fasteners that look like Phillips. But the JIS standard still applies to the production of the JIS hardware itself. Supposedly. What I think happens, is that regular Phillips still don't fit some hardware very well, some times. To add to the confusion, there is a newer standard, that might or might not be used in manufacturing. DIN 5260-PH/ISO 8763-1. All I get out of the new standard, is that it is very close to the old JIS. Adding to the confusion, motorcycle manufacturing might use the old JIS hardware, or the newer, maybe, or maybe not. What will remain true, is that if you run across a sloppy fit, which is most likely the old hardware (or perhaps even the newest standards), you will need either the JIS or the DIN 5260-PH/ISO 8763-1 screwdriver. Especially if you own an older bike, like before 1980 or certainly 1970.
Here's a bit of a forum article that compares the Phillips vs. JIS vs. DIN 5260-PH/ISO 8763-1
And this, from WebBikeWorld on the subject, where the comments are worth reading. Although they were completely confused by the situation as well.
And I think Hosan JIS screwdriver sets are junk. I suspect the current Vessel sets will work for just about everything. The Vessel sets are no longer advertised as being JIS.
I have older JIS screwdrivers, and a JIS T-handle bit set that the bits work with the impact driver. I just picked up what I hope is old stock JIS Vessel, for a "yankee" right angle bit ratchet, and a handle with 4 reversible JIS bits. Much of what appears to be the "old" JIS is going out of stock.