No, Nixon resigned before the House voted on the Articles of Impeachment. He knew he was going to be impeached, but it had not actually happened yet.
But your point is right that Nixon was driven from office for much less than what Shrillary has done and is “getting away with.” Hell, she had her lawyers delete 30,000+ emails, that right there is far more deleting than 18 1/2 min. of audio tape!! Never mind everything else that Hillary has provably done......
Coming back to the new panel. Is Cummings questioning integrity of the OIG?