My understanding is that it is correct to say "sell the same" OR "sell the same items/things"...the item(s) in question will be known to your conversation partner(s), a shopkeeper, market vendor or online trader, for example...I'm going to flag this answer for inclusion of the alternative phrase.
These things are added sentence by sentence, so if it was not accepted here it would have to be reported at this sentence too, as long as the rest of your sentence here was also correct. A translation from English to French does not necessarily mean that the backwards translation is always correct too. Here it should be correct. Some words have more meanings in one language than the other, so it is not automatically set up to work backwards and forwards for all sentences in case context matters.