@Im_Pando Afaik yes! Back in 2005 when they were forbidden to change tyres in the race they sometimes changed the tyre pressure during a pitstop too hahah
I cant find anything limiting tyre pressures in the technical regulations + it wouldnt make any sense, front left may have a different pressure than rear right but for example C5s must use the same pressure as C2s (like in Australia last year) which by my observations have something around a 20° difference in working range, having to use a single pressure for both would be hilarious because one of the tyres couldnt work!