Thought so. In here [link] you put the all-new weapons for them, and a little piece of the old ones to compare. After awhile, I came to conclusion; "NCH only fixed and upgraded Yoko's cannon, instead of changing it with the new one". Well, I do like that kind of cannon anyway. The new bazooka seems to be armed with rockets, not photon laser.
to be frank, the "revamp" cannon I drew for yoko in that link was actually like a quick half-hearted design. And I personally didnt really like it so I just detailed/high-def'd it up for her in this animation.
I see. Seems to me that the bazooka is her 'handgun' and the cannon here is her 'rifle'. Oh, also, I noticed that in the old animation, in Yoko's turn, the cannon 'bounces' when it was put to stand. In here, that doesn't happen, so it's only my guess, but it seems that people likes the old one because of that bounce. More lively, maybe.