If my partner and i are both herpes simplex type one and we had oral sex. could we both become herpes simplex type two? ?

Location change only: Herpes simplex type 1&2 are two different strains of the virus in the same family (chicken pox is actually a herpes virus too). It used to be a big deal having type 1(oral) vs 2 (genital) but the sexual revolution had changed this perception a bit--type 1 can be down below and type 2 can occur above, but one does not change into another. Live well, live safely, and protect yourself. Good luck.