http://www.scrapmetalforum.com/elect...-question.html
http://www.scrapmetalforum.com/elect...rds-parts.html
That's about all I can help you with right now, there is no show-all, tell-all link, some of it is just a matter of grading by IC chips and pin/fingers.
If you have a buyer in mind that your thinking about using then you might send them a email with pictures of the boards in question to get the answers.
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