Color of center caps different?

I just swapped a big bolt pattern 8.25 on my 72 Scamp. Front is still small. I’ve been running rallye wheels, so I need new ones for the back. My question is when I’m shopping for the centers, it looks like 1972 bbp is lighter argent and the 1972 sbp is darker, both in the acorn style. Same year but different color based on bolt patterns. I can't seem to find a bbp darker acorn center.

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