Difference between Dovobet & Dovonex

Dear Sir I have been a long time sufferer of Psoriasis. I visit a NHS dermatology specialist who prescribes different medications. The specialist has prescribed both Dovonex & Dovobet in the past, I am currently applying Dovobet Gel. I visited my GP to have Dovobet Gel added to my regular list, to replace the Dovonex Ointment already there, I have a letter from the specialist advising the need for Dovobet Gel. My GP insisted they are both the same and Dovonex would have the same effect. Who is correct, my GP or my Specialist. John