There is a slight difference in colour/a slight colour difference of the hand towels supplied.

[PRD2021]

1. There is a slight difference in colour of the hand towels supplied. There are light and dark colours.
2. There is a slight colour difference in hand towels supplied. There are light and dark colours.

Would you please tell me which sentence is grammatically correct? Is it difference in colour or colour difference?

 

[Barque]

I prefer "difference in colour" to "colour difference" though they're both grammatical.

I'd express what you're trying to say very differently however.
The hand towels provided aren't all the same colour. Some are light and some are dark.

(The difference between a light and a dark colour isn't likely to be slight.)

Is it "difference in colour" or "colour difference"?

Please note the quotation marks. You need them (or italics) if you're referring to the words themselves, rather than using the words as part of the sentence.