Who has made comparisons? Certainly they did in Kennedy and Nixon and almost did in and at least hampered Reagan.
Both Reagan and Trump compromised on their VP to secure their wins, but at least Reagan didn’t make liberal Ron Jr a senior advisor and bring in hoards of other liberal advisors.
Reagan’s appointees were more loyal than Trump’s have been. That is not too surprising since Trump was and still is a political novice. But I think if Reagan had faced a swamp as big and ugly as the one Trump has faced, his story might have been very different.