No he can’t, but Ronaldo can score you those goals we desperately needed. I actually see Ronaldo complementing Havertz game much better, Havertz doesn’t score enough to justify him leading your line. Adding CR7 would be good for him.
The only similarity between Ronaldo and Lukaku is defensive work rate, Ronaldo scores against everyone, his movement is on another level to Lukaku. I see Ronaldo blending in much better than Lukaku.
Honestly it is a disgrace to have both of them in the same sentence.