Haha yeah don't think so, Mario's time with us has come to a close and we want to sell him this window, but looking at this season's stats even at 33 he's been technically better than Lukaku who is 26. And he's had a disappointing second half of the season, mind you.
I know you just wanted to say that he won't be good at United, and that I can agree with since he's no longer in his prime (thus getting worse in all aspects of his game) and we're willing to let him go, but saying that he's technically way worse than Lukaku is ridiculous. He's not a technical player, but in his prime he was twice the player Lukaku is.
Not to mention the fact that he's had to do the dirty work on the wing for Allegri countless times, even going as back as a defensive fullback during matches, whereas Lukaku always started as the main striker.