First Camavinga is more like Gattuso, Kante like player than Casemiro like player. Other thing is Casemiro didn't play to provide technical skill in the midfield. Kroos and Modric provide way too much technical skill to the midfield. If you want to replace Casemiro, it makes more sense to play a 4 man midfield and playing both Valverde and Aurelian because Camavinga can't play that position of DM.
Nobody from history can replace Casemiro's work in midfield. Have you seen his tackling and positioning skills. He literally carried Kroos and Modric for all these years. Doing work of multiple men alone. Not possible to replace and no sense to replace someone like that with technical ability.