Reagan was a conservative democrat, Trump a liberal.
Reagan was also a Republican for decades prior to running for president and never looked back once he switched. He certainly never said, "I probably identify more as a demcoRAT" as Trump did in 2004, he never gave money to the democRAT party as Trump has done and he didn't show liberal leanings once he switched.
Reagan actually raised money for democrats when he was a union leader and a democrat.