The title. Are they the same or very distinct with each other? Can we consider a fan having a locked rotor protection to have a locked rotor sensor feature?
Welcome to the tech forum. Here is a good article on the differences between the two types and yes they are different. Fan Features - Electromechanical / Fans, Thermal Management - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key (digikey.com)