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Barry, the main thing is the updated styling i think. A new bonnet.
Technically spoken, the differences are small. maybe 5% less fuel and oil consumption, one or 2 decibel less noise, that sort of things.
And 12145 has automatic No-Spin differential lock in front axle! 12145 has hydraulic steering too when 12045 has only old fashioned power steering. Maybe different hydraulic pump, but Im not sure.