Not really. The basic abilities of a Fighter, Ranger and Paladin were the same. Same attack tables, same save tables, same weapons (initially). Could use the same magic items (except for the subclass-specific holy avenger, which could actually still be used by fighters but not as well).
Subclasses in 1E were a lot closer to the base class with the vast majority of mechanics coming from the base class and only a few add on, mostly minor, abilities from the Paladin or Ranger subclass. The main thing was they all got to use all weapons and all armor. when the Paladin went under the Cavalier, they transitioned to the cavalier abilities and restrictions.
2E did introduce some separation between them.