The 76ers has the right to swap with no protection (it is protected for 11-30 because of the pick we owe to Chicago, but it is meaningless) this year and next year- this is why it was framed as us trading away our lottery balls.
We also owe them a first round pick (not a swap) top 10 protected in 2018, and unprotected in 2019 (and if we fail to give Chicago a pick this year because of the stepien rule it will be an automatic 2019 unprotected).