That sheet metal in both photos is Version 1 for both YM2000 and YM240. Both are before about 1978, and both should be green.
When they went to Version 2 sheetmetal (headlights inside grille), they started painting their domestic version (YM2000) red at that transition. But the export (YM240) tractors with the later sheetmetal stayed green clear until the end of the series, about 1982.
I think the transition Version1/Version2 for the YM240 was between 1977/1978?? I don't know for YM2000 but it might have been earlier.
You can see examples of both styles in my YM240 US sales brochures referenced from my sig below.
There was also a Version 3 ("Revision level 4") on the US tractors only, still painted green, where they put the air cleaner external out the left side of the hood. I think that started/ended in the YM240 about 1982, its final year. (all dates approximate).
That tractor's chassis number, stamped by the operator's left ankle, will contain the model #.
If you are thinking about buying it, the only significant difference is the US version has a PTO overrun 'clutch' (ratchet) inside the transmission. Other slight differences like the direction the throttle moves, are to match US style but are not significant.