It might not be the most intuitive to think that they are similar jobs, but this is the situation he walked into at Burnley in his first season, just on a much larger scale. It turned out to be the ideal environment at the time. He will be able to make a big overhaul, but this time with 100x as much finances and pulling power. He can build his team in his own image due to the turnover/process stage that Bayern are in, plus they will not then hit a wall the following season like Burnley as there is no promotion into a higher level, they are already there.
Even though they have struggled badly under Tuchel, Bayern should still be considered the dominant team in Germany and one of the stronger teams of Europe if they click into gear in the right system.
I do believe he has what it takes to get this right, he is an incredibly intelligent man both tactically and in the traditional sense of the word, he's also a great man-motivator, and this opportunity has fallen into his lap like a trick of the fates. So many things had to fall into place for this to happen, but sometimes that leads to the most special things, and it's up to him to make this one of those times.