Does the MK have weapons or is it clean? F-35's "disclosed official" combat radius/range numbers are done with internal weapons including its top speed unlike 4th gen fighters.
With A2A loads, the MK's combat radius is 1300+Km. With A2G loads, it's 1000+Km. The F-35A's maximum combat radius is said to be about 1100Km with its internal load.