Years ago, I did have a go at it with my collection which is mostly early or from the mid-later '70s, with only a few of the later bits up to the early '90s, and only a couple of examples from the '90s.
I found several variations of scripts which could be described as basically being the same - and could only conclude that as marking things depended on there being equipment and a member of staff having the time to do it, there must have been a sort of general idea of how the script should look and several different folk tried to keep the marks looking similar.
Obviously, the exceptions are when the marks were made by Michael Harris, or Eric Dobson, their writing is very distinctive, and no "ideal" script was being adhered to.
I got to about 27 different scripts before giving up and deciding it was a useless and futile task.
There is a basic big early loopy style in a thin line, then there is the very broad lettering made with some tool which vibrates at right-angles to the direction of the line being made, later it progresses to the one which looks as if it reads Molina and the loopier but legible one you have there....