The wiki article states 'Stop Stop Stop' is similar to 'Come On Back' and indeed there IS a similarity between the structure of the lines;
'Been so long since I last saw you...' / 'See The Girl with cymbals on her fingers...'
However overall I think the similarity probably ends there
In truth much differs between the 1964 and 1966 songs - the repeated harmony cries of 'Come On Back' and the harmonised lines of 'Stop Stop Stop' don't really tie up while the descending bridge line; 'it's not so very hard to make me feel this way...' etc repeated after the instrumental break has no relation to the verses in 'Stop Stop Stop' where calls of 'Stop Stop Stop' then a verse follows the banjo solo without any interruption to the flow of the song at all
instrumentally the R & B style blasts of harmonica in 'Come On Back' together with the periodic pauses bear no resemblance to the continual slightly speeded up banjo led driving lines of 'Stop Stop' Stop which has an hypnotic feel to it with Bernie's bass line adding to the almost 'Russian'/ 'Greek' dancing styled sounding swaying instrumentation which notably rises up in scale for the harmony vocal calls of 'Stop Stop Stop' together with Bobby's punctuated cymbal crashes then eases back down...
the repeated harmony calls vocal style of; 'Can't find the words, the words to say...' in 'Come On Back' are nowhere to be found in 'Stop Stop Stop'
the emphatic title call vocals/instruments conclusion to 'Come On Back' is completely different to the instruments led with fading harmonies duly rising in scale and 'weaving' over the running fade out of 'Stop Stop Stop' with Clarke and Nash moving into their falsetto range right at the very ending of the vocal fadeout so again here both songs notably differ
re the vocals it's Clarke followed by Hicks/Nash joining in on 'Come On Back' and backing Clarke on the bridge section...
where as later on 'Stop Stop Stop' it's Clarke...('See the girl with cymbals on her fingers entering through the door...') then Clarke/Nash ('bells of heat go ting a ling a linging...') ....then back to Clarke ('now she dancing going through the movements...')....then Clarke/Nash ('....blood is rushing temperature is rising sweating from my brow, like a snake her body fascinates me I can't look away now...'')....before finally Clarke-Hicks-Nash on the title line;('Stop Stop Stop all the dancing give me time to breathe...') - this vocal build up is repeated throughout the song and is quite intricate re who sings what so that it duly appears to be very carefree and singalong
many Hollies songs that seem very 'simplistic' and carefree on closer examination are anything but re who sings what vocal parts - often on songs that never break the flow so everyone has to get their vocal part spot on throughout with NO room for error at any point (think 'Listen To Me' / 'Sorry Suzanne' etc)
the banjo solo on 'Stop Stop Stop' was actually longer - the full version can be found on a few CD sets - and was edited down for the single / album track version in 1966 so further differentation between the songs
I would agree that elements of 'Come On Back' can be found re the verse lines of 'Stop Stop Stop' so the 1964 'B' side probably served as a foundation influence - as say 'Mr Tambourine Man' was for 'Carrie Anne' via 'Hey Mister Man' etc but to me ''Come On Back' and 'Stop Stop Stop' are really two different songs not any 're-working' as such due to the fact each number has many differing aspects
