Okay, I'll admit there's a lot of hearsay, I think my model guide even states a few of these unsubstantiated 'facts' as well - should probably amend those at this stage.
So the only place I've ever seen reference to the Snow Versions in print is actually in the options guide at the back of the Toyota brochures. There's a grid and one of the options available on the whole range is the 'Snow Version'. It references Hokkaido District and states that the specification will include contents specific to that area. It doesn't states exactly what these are but if I were pushed I'd go with snow tyres at the bare minimum. I've had a few Snow version GT's and they have all been packing snow tyres and yellow headlamps. Could just be a coincidence but given that Hokkaido is at the north end of the island and resembles a Russian climate, it makes a lot of sense. In fact it's the reason why we have AWD versions of most Japanese models in general, the weather is very severe.
Im gunna bump this back up, i checked the part number on my starter motor today, having checked the part numbers online, theres 2 options, an .8kw one or 1.0kw starter. The part number on it matches the 1.0kw part number.