An FCC regulation (like the Net Neutrality order) is one promulgated by a Federal agency, all of which are directly accountable to the Executive branch rather than the Legislative. They have the power to put in place regulations and rules without having to get Congress to pass a bunch of new laws.
The CRA is supposed to be a Congressional check on the power of the President, although in practise it’s mainly been used by GOP Congresspeople since early 2017 to overturn regulations or rules promulgated by agencies under Obama.
The Net Neutrality order will also be fought through lawsuits via the Judicial branch. It’s basically a full-court press for anyone who wants to retain a free and open Internet against the Executive Branch and the agency it controls, a couple of dozen GOP Senators, a bunch of GOP Reps, and the telcos and cablecos and their lobbyists.
