Fundamentally the bikes are the same. 2300cc, shaft drive, 5 speed, 2 headlights. Virtually all the bits look the same, guards are the same, bear claw the same shape, intake run the same. Changes to riding position are more than cosmetic but still don't represent a major change to the bike overall. Addition of ABS, gear indicator, fuel GUAGE are really just enhancements.
It is, nevertheless important to know what bike someone has IF THEY WANT HELP ON THIS SITE. Even things like the gear position sensors have changed over time but also there have important upgrades to the gear box, and sump plug layout has changed since the early models. Knowing the year of a bike can impact on the advice someone is given because, contrary to the comment above, plenty of members actually know the differences. ECUs aren't necessarily interchangeable either.
And by the way, there have been no changes to OEM tyres fitted to Standard/Classic/Roadster models over the years.