As no detail type description here, are these genuine jis b 4633 type?

Hozan doesn't spec B4633 anywhere that I can find, not on their website nor catalog. If a manufacturer doesn't specifically claim B4633, then you're looking at a DIN 5260-PH/ISO 8763-1 product. Even Sunflag no longer specs B4633 on their own website. It's increasingly difficult to find TRUE JIS drivers.

How long is the longest one

16.25 inches, tip to end of handle (end to end). Side note: even though I hardly use the long one the others have been invaluable.

Is the one extra-long driver the same tip size as one of the others in the set? Is it for extra length only?

An extra long version of the most used size is very good for getting something perpendicular to the part, to avoid crossthreading. It's why you'd want an extra long screwdriver for each of the most common type and sized end;JIS, pozidrive, phillips, and flat-tip, etc..

Manufacturer	HOZAN
Part Number	H-885
Product Dimensions	30 x 3.35 x 3.35 cm; 299.37 g
Item model number	H-885
Colour	White
Material	Plastic, Rubber
Item Package Quantity	1
Head Style	JIS
Special Features	Soft Grip
Included Components	Handle
Batteries included?	No
Batteries Required?	No
Item Weight	299 g

Hozan JIS-5 JIS Screwdriver Set (NEW 3rd Gen.) by HOZAN

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