@Raees said the same, but Vieri didn't bust his gut getting in the box incessantly like Haaland does, nor did he run away from the ball with such frequency or voracity, and he was a much bigger threat from 25-30 yards out (cracking shots) I think Bobo's technique was also on another level to anything Haaland has displayed to date and he was better at holding up the ball.
For me personally, it's really hard to bracket Haaland's game with other strikers that come to mind since the mid 90's, at least.
The desire he has to run away from the ball reminds me most of Alen Boksic, but he doesn't have that deftness to his finishing, preferring instead to take cracks at goal, but that, to me, is where he's an oddity because his striking inside the box after all that running is more akin to a 6-yard striker than a runner.
First thing that comes to mind is that he runs towards goal as a primary instinct, which I guess would be template from which I'm trying to draw comparisons.