The MCU is a film adaptation of the 616 universe. Not everything is exactly as it was in the comics. It is not the same universe. However, the MCU is regardless set in the 616 universe. So far, what has been shown to us through the MCU so far dictates that it cannot be the same multiverse as the comics. It simply can’t be. (There is only one America Chavez, which according to the comics that is untrue. The Darkhold is destroyed across the multiverse, which is not true in the comics. Etc.)
The idea that the MCU should be tied down by the Multiversal rules of the comics is absurd. The MCU is its own thing and will continue to be its own thing set on its own specific Earth-616.