On this issue there is no difference between the previous admin and the current one. The FTC voted 3-0 to postpone. Even though Trump fired two of the original five, if those two had both voted against postponing they would have still lost 3-2 and the same decision would be reached — and I don't think there's much evidence that the two he fired would've voted against postponing, anyway.
This is incorrect. The party makeup of the 5 people changed with the new administration. Lina Khan (D) left and Mark Meador (R) was appointed, changing the balance from 3(D)-2(R) to 2(D)-3(R).
Ah, I hadn't realized that. Still, given that it was 3-0, all three of the former FTC commissioners would have had to be unanimous against deferral — and given that all of them voted for deferral on Jan 19th [1] (the original deadline, when none had been fired and Lina Khan was still onboard) — I don't think there's much change here.