Not in stength may be..Since Naruto has high chakra stamina.But in skills, and clever we just need to wait and see.What if Konohamaru develop some super jutsu?
Your throwing out a lot of big
if's I mean look at it this way Konohamaru has had special training way before he was a Genin and if I were to be honest I'd of expected him to be at a higher level really so it's debatable between who is actually a faster learner since Naruto only really started his training when Jiraiya showed up, I'm not going to count Kakashi as training since all he was taught from his was to channel chakra to his feet.
Also you say what if Konohamaru develops some super technique, well he hasn't really learnt anything spectacular yet has he I mean his jutsu variety is basically just what Naruto has, and already Naruto has created a super technique which I don't see how Konohamaru can surpass Rasenshuriken is the final form of the Rasengan.
Also as people are saying we don't know technically how long it took Konohamaru to learn the Rasengan but it's fair to say he had it easier since Naruto had to learn his while during a mission, while Konohamaru was in Konoha with all the time in the world.
Basically my point is Naruto has worked far harder than Konohamaru since he's Konohamaru has had everything spoon fed to him.