In Taylor numbers, DPD #3 is R-0003, while the OTO reagent is {EDIT}R-0600{/EDIT}. They are completely different products, both with a yellow cap.
Last season, WalMart was carrying a kit made by HTH, which actually contains reagents made by Taylor. But they use cheaper versions of the reagents, not the exact same ones used in the TFTestKits kits, or the Taylor branded kits. WalMart does change suppliers now and then. They are very price sensitive and look for the best deal they can get. I haven't checked who they are using this year. The kit they carried before the HTH kit contained reagents made by someone else.