Probably, but not necessarily...(actually I just checked and it looks like the points plate is the same across all models or can be used in all models. The diagram for the K0 looks like a different part)
Basically for the K model the number indicates the year the bike was produced (roughly). K0 = 69-70, K1=70-71, etc.
For cb750's there are three models K (69-78), F (75-78) and A (76-78).
But it's not that easy...
The K's are basically 4 generations more or less K0, K1, K2-K6, K7-K8. While a number of parts are similar across all K models, there are differences. For example, the K7-K8 seats hinge on the left side and lock on the right. Earlier K's were vice versa.
The F's are basically 2 generations F&F1 (made in 75-76) and F2&F3 (made in 77-78). Why they didn't call them F5-F8, I don't know. To confuse us 30+ years later I guess. The F models had rear disks (75-76 were spoked, 77-78 were comstars), different seats\cowls, engines painted black and some differences internal to the engine.
The automatics were made in 76-78 and were called the A1 (76), A2 (77) and A3 (78) that's about all I know about 'em. Sorry.
To further confuse things sometimes the F models of the same year have more in common with the K bikes than earlier K models. For example the F2, F3, K7 and K8 have longer output shafts. Hence they have different front and rear sprockets and use different chains than the earlier K bikes. Clear as mud???
You can see all the different models and the years they were produced here...
http://www.sohc4.net/index.php?q=content/cb750For the 750's, just click the model and you'll get the info you are looking for...
For the 550's same thing...
http://www.sohc4.net/index.php?q=node/203Now as far as parts go to a place like CMSNL and use their fiche/parts lookup and check the part numbers...
http://www.cmsnl.com/honda-cb-four_model7148/And when you definitely need to know if a part will interchange, just post here and ask.
Hope that helps...
