Because 'color' = 'green' while 'of different origin' = 'Romanian'. It is a slightly different structure.
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PamQueue I also had to recognize that people were different colors and of different national origins." This suggests: "People were different colors.""People were of different national origins." How come one requires "of" and the other doesn't (or so it seems)?"
PamQueueUsing less-contraversial examples:
"The two cats are different sizes."
"The two cats are of different sizes."
"The two cats are different colors."
"The two cats are of different colors." "
The two houses are different prices."
"The two houses are of different prices." How do I know when to use "of"?
I wouldn't