Luffy&Zoro are like this 2:
100 % the same in some aspects. Best friends, strongest duo, serious/naive, same diff in strength, unofficial "vice captains", whenever Zoro/Vegeta get to the same level as Luffy/Goku the later duo always pull clear again (SSJ2/SSJ3 etc), L/G get everybody to follow them while Z/V train the hardest alone.
I compared them to Ranma/Ryoga once, same dynamics.
Difference between OP/DBZ is there has not been any real rivalry in OP since Whiskey Peak, Zoro accepts Luffy as #1 and Vegeta didn't accept Goku as #1 before Majin Buu.