ADALM-PLUTO can be updated to extend its frequency range according to the [1]. The wiki mentions that AD9364 and AD9363 chips are nearly identical, however does not mention what exactly so that the range of the 9363 can be extended. There should be a reason why ADI does not do this themself. I suspect it is the quality control, however I wanted to be sure.
A student of mine would be very happy to get a qualified answer on this.