I spent a great deal of time on that page collecting the information and images to put onto the page and I logged back onto the Wiki on 10.8.14 to notice that it was deleted by you; if you could give me a reason why, my email address is below...
Please watch the episodes New Tune, Old Fiddle and Shock to the System where the Cato character first appears (you can get them from Hexicode if you don't have them). There are several scenes where various characters (Garfield and Datta, Burnside and Meadows, and Brownlow and the DAC) refer to the incidents from the 1990 episodes that Twist was involved in (the corrupt Barton Street sergeant and Tom Penny's drink-driving), that they really are the same character.
There is no direct "proof" (although I'm not sure what "proof" you want), which is why I wrote that it is "implied from dialogue". Sometimes character names have to be changed, e.g. Tommy Burnside became Frank Burnside when he became a regular character. Or it could just be artistic license.
i've seen these episodes and still have them from when the hexicode channel went down, i notice a similarites but it's pure coincidence because it's the same actor, whereas burnside, that was changed because there was a real life tommy burnisde in the force, you can see this in the bill made me famous
It's not "pure coincidence", its much more than that. In one scene in New Tune, Old Fiddle, Meadows refers to how "Sun Hill got one of his [i.e. Cato's] skippers binned", while in Shock to the System, Garfield states that "Tom Penny blew the whistle on Cato's custody sergeant". Clearly, both are referring to the storyline of the 1990 episodes Close Co-operation and Corkscrew. In the same scene (taking to Datta in the car), Garfield also mentions about how Cato "got Tom Penny the sack", referring to the plot of One for the Road. Also, in Shake, Rattle and Roll, Brownlow and DAC Hicks discuss how Cato was involved in Penny's dismissal.
I'm still not sure what "proof" you want, but all of this strongly suggests that Cato and Twist were intended as the same character.