how to determine diecast scale

I've had this 2003 Jeff Gordon Diecast for about 2 and a half years and I don't know the scale. I compared it with a Denny Hamlin 1/24 that I own and there was a difference in size, so could anybody identify the scale? : r/NASCARCollectors

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I've had this 2003 Jeff Gordon Diecast for about 2 and a half years and I don't know the scale. I compared it with a Denny Hamlin 1/24 that I own and

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