Trump is more conservative because Trump is willing to fight the media cartel that has taken control of the country.
Romney was not. A candidate who will fight the enemy is far better and more likely to accomplish some of Conservative’s goals than one who will not even acknowledge that there is an enemy.
That is the difference.
Just the willingness to fight the media is not necessarily a sign of conservatism. I think it has more to do with his ego than his principles.