The only time I've heard Trump compare himself to Reagan is when he's asked about his past liberal positions. He says "That was a long time ago and I changed, by the way Ronald Reagan was a loyal Democrat and pretty liberal guy for years when he was young but he changed and became pretty conservative". He doesn't say he has Reagan's positions or that he's the next Reagan, at least I haven't heard him do so.
That and the fact that they both are outsiders of the HOPe.