That is true. However: Le Pen also comes across as more radical than Hofer.
One of the reasons why Hofer was as successful as he was is that he managed to position himself as somewhat moderate, and appealed to not only the FPÖ core voter base but also a lot of more neutral people. He was less "aggressive" in his program than Le Pen appears to be, and that is a factor that I would not underestimate when it comes to actually voting on election day.
Yes, Le Pen has more attack surface to work with, so to say. But she also polarises more. Just like the FN inherently polarises more than the FPÖ.