you all seem to need some lessons in frame spotting.
1. IGNORE the colour
2. match lugs, braze-ons, frame stops
3. look for more subtle things like pencil stays, tube width and so-on
DOnt just fink 'cos it gween its gotta be a Ralleey Underpants.
Didn't have time to look up the summit to spot any differences (my memory did fail me though as it's purple anyway), but I do know a bit about production and ecomomies of scale.
It's far easier to not decal the frames during production and only do this when bikes are assembled than to paint a different frame in a unique way. Painting is expensive and time consuming decalling is not. So colours may also hold true.