The tradition mentioned above has also been transmitted by Simak (b. Harb) with a different chain of narrators and to the same effect. The first version is more perfect. It does not mention the words "at the current rate".
Sunan Abi Dawud Book 23, Hadith 30
← Previous Hadith I used to sell camels at al-Baqi for dinars and take dirhams for them, and sell for dirhams and take dinars for them. I would take these for these and give these for these. I went to the Messenger of Allah (ﷺ) who was in the house of Hafsah. I said: Messenger of Allah , take it easy, I shall ask you (a question): I sell camels at al-Baqi'. I sell (them) for dinars and take dirhams and I sell for dirhams and take dinars. I take these for these, and give these for these. The Messenger of Allah (ﷺ) then said: There is no harm in taking them at the current rate so long as you do not separate leaving something to be settled.

Sunan Abi Dawud Book 23, Hadith 29 Next Hadith → The Prophet (ﷺ) forbade selling animals for animals when payment was to be made at a later date.

Sunan Abi Dawud Book 23, Hadith 31