C3 have homologation valid until 2030. Sure they will still get some updates until then. Don't know for how long will Lancia get their homologation cycle, but probably at least until the whole Rally2 concept will last (as someone said that the class is going towards it's end cycle). Of course it's newer, and they promise it's better, and most probably it will get upgrades, the most money out of Stellantis and it's the works car, so it will surely be good.