Sorry, I don't think you'll know what they are until you grow them.

from what I know, the solid black/dark brown ones that look like rounded squares have green leaves

the molted lighter brown one with streaking is the common red variety

the even lighter brown/silvery whitish ones should be the same as the streaked ones (red leaves) but maybe the seed coat was partially scraped off. another possibility is that the seeds were'nt ripe when they were picked. to check (at least with castor beans) give them a good squeeze between the index finger and thumb. if they crumber, they wer too old and wouldn't have grown. If should take quite a bit of force to squish viable beans.

Do a search for the seeds on google, there are a few pages with what seeds are of which cultivar

I love, love Castor beans. Where can you get them locally? Thanks