On Lukaku and Drogba, they're very different strikers. Lukaku comes across as big and strong, but he's a pretty mediocre target man and he actually operates like a poacher, coming 'alive' in the box and trying to work the channels/get in behind off it. His actual other than the odd bullish moment is similar to strikers who are less physically imposing. Drogba on the other hand doesn't look as dominant physically but absolutely was. He was more like Diego Costa - strong center forward work, excellent at holding up and bringing others into play, a real focal point, unlike Lukaku who is best less involved (until the fag end of the move). More skillful and mobile than Costa of course.
Athe awme time the comparison isn't absurd given the pace and power they possess. If you don't delve deeper they appear to be similar to the naked eye.