Keihin 725B

Any one a resident expert (PJ, i'm looking at you!) on Honda CB carbs?

I see that the CB350 has a variety of carbs for it, each with different specs (3D, 722A, 726A etc).

I can't find much on the 725B kind, more specifically, if they were used for the CB350 as well as the CB250?

I'm trying to find the stock carb specs for the CB250k4, but coming up short. I have a shop manual for the early (k0-k2 ish) models, which specifies some specs for the carbs, but with the varying specs for different model carbs on the 350 i'm not sure whether they will be suitable as the manual doesn't specify carb models.

Can anyone shed some light on which models used which carbs?

Unless your doing a 10/10 restoration I wouldn't worry about things too much. Fuel is completely different compared to what was available in 1960's/70's so jetting and maybe float level will need adjusting. The CV carbs are often the same for 250 and 350, even the jetting.
Really, you have to get things working then change stuff to make it work properly/better