Interviewing for engineering managment at Facebook, getting M2+

I'm in the process of interviewing at Facebook, was surprised how their first rounds and phone rounds require no algorithms. My question is how hard is it to get above M1? I'm 14 years into my carieer been a director, vp, and cto at various companies from 50 people to 500 people. Most times I can pull 300+k in cash plus a few percent equity when joining startups so I worry even if I make it to the end of the interview m1 comp bracket wont be able to match where I am at.