I need to replace a ST3500320NS drive in a PS5000. Would a ST3500514NS from another EQ be compatible?

Also, I found a pair of ST3750640NS drives for a good price on ebay. The description and title say Equallogic, but the ad says they've been tested and wiped. Would the wipe render them unusable for our EQ?

http://www.ebay.com/itm/Two-Dell-EqualLogic-PS5000-PS6000-750GB-SATA-To-SAS-Tray-3-5-Hard-Drives-K3GGP-/221909290780?hash=item33aad30f1c

Thanks.