Both have a truck centre-centre distance of 40'0"
However, the SD40 is 68'10" overall length, and the SD45 is 65'9.5" overall.
Three feet translates to about 3/8" in HO, so the SD40 shells wouldn't
fit an SD45 chassis, and vice versa.
Here's a website will all kinds of technical data:
You can repaint and redecorate any shell.
Have a good day,
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