I haven't been able to understand the previous discussion, because - qeylIS knows - my brain lacks the "ability to understand grammar circuit". So I need to ask.

Ca'Non A:

Qo'noS tuqmey muvchuqmoH qeylIS

kahless united the tribes of kronos

Ca'Non B:

nItlhDu' vIvechchuqmoH

I cross my fingers

Is there any difference between A and B? Aren't they exactly the same?

Yes, they use the same grammar. The main difference is that the first one doesn't have a prefix, so ostensibly conforms to the restriction given in TKD about prefixes with reflexive suffixes. The second one flagrantly violates it. I believe the text of TKD isn't trying to be a comprehensive rule about prefixes, but rather describes the fact that objects in English like myself and each other aren't objects in Klingon but are instead built into the suffix.

-- 
SuStel
http://trimboli.name