How much overlap is there now that two similar yet 10 years different rovers are in operation ? Is it possible to share some of the human/software/planning reso

How much overlap is there now that two similar yet 10 years different rovers are in operation ? Is it possible to share some of the human/software/planning resources or are they basically two separate efforts by this points ? Also, do the Rover Drivers still live on the Mars time that makes their working hours shift by 45 minutes every day, like in the good old MER days ? ;-)