Yes – I believe he would but only in one Finals, 2011. In 2011 Lebron famously melted down and I don’t think that would have happened to Magic.
For the other 5 lost Finals – no I don’t think so. 2007, 2015, and 2018 Lebron’s second best scorers were Zydrunas, Delladova, and a very inconsistent Kevin Love. I don’t think Magic would have done much better than Lebron did, especially considering that Magic is not as good a scorer as Lebron was.
In 2014 and 2017 the Cavs were simply up against two of the greatest NBA teams of all time, and its doubtful that Magic would have beaten them. Keep in mind Magic played most of his career with the NBA’s all time leading scorer.
Another thing I might note is that Magic might have lost the 2016 Finals. I don’t think he would have been able to come back up from 3–1 down to win the series the way Lebron did. So maybe he would have ended up with 3 rings either way – just swap 2011 with 2016.