It is hard to tell unless you know what it was sold to you as. Cinnamons and Black Pastels can look way different from one another or almost the same. As a general rule cinnamons and their crosses are usually lighter. There are, however, very light black pastels and dark cinnamons.
Example of a dark cinnamon:
And her offspring, including a pair of cinnamon pewters:
The short answer is that people can guess all day long, but it may be impossible to know for sure. Breeding them out might give you some clues or it might not.
I say it doesn't matter though, since they are both gorgeous pewters!
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