You are right on the b973/20 being a generic Adderall 20mg. Here is a picture to confirm: http://media.cornerdrugstore.com/dru...5/dext020a.jpg

The other one I believe is actually imprinted cor 135 and is the same thing, generic Adderall - Amphetamine/Dextroamphetamine Combo 20mg - made by a different manufacturer. Here is a picture of the second one to confirm: http://media.cornerdrugstore.com/dru...2/amph010a.jpg