Earlier quoted context omitted.
Overhead rates at pure research non-profits are much lower than at universities. The difference is the amount of bureaucracy.
No, overheads for research organisations, non-profit or otherwise, are typically higher than universities. Researchers cost way more than grad students and researchers have similar percentages of overhead too.
I'm sure there are particular examples of places with high overheads, even higher than the 70% at top universities, especially in the biosciences, but historically pure soft money places have been relatively cheap to operate.