Not a fair comparison, nor a fair expectation.
Chicharito was out there with the likes of Rooney, Berbatov, Nani, Scholes, Giggs, Carrick, etc. There wasn't a ton of pressure on Chicharito to score goals because you had Rooney and Berbatov, who between the two of them scored 37 goals that season.
We're basically pinning all our hopes of scoring goals on this 20 year old kid, and assuming that along the way Rashford will have an approximation of the season he had last year, which as things stand right now is looking increasingly unlikely.
If Hojlund scores 10 goals this season it'll be a resounding success, all things considered.