Cavani is almost the exact opposite of Icardi. The only similarity is their world class off the ball movement but that's it.
Icardi barely exists in the whole game except at a brief moment when he ghosts past defenders and slots in the ball behind the net.
Cavani, on the other hand, is very active in game. He constantly runs through channel, opens up space either for himself or his teammates, spearheading team press, he does not shy away to hold up ball, does not hesitate to battle defenders etc. But his product in front of goal is beyond abysmal. His stats often deceives people that he is a terrific goalscorer while the fact is he makes plenty of chances which he misses a lot.