Difference in salary between consulting and audit/tax/legal

#1

I have a management consulting background and spent half a decade in senior strategy and project management roles in consumer goods/manufacturing. I now may have an opportunity to join a big4 firm in Europe with their consulting division at Senior Manager level (might be able to stretch to Director, we’ll see).

I understand roles at the consulting divisions of the big4 firms pay significantly more than equivalent roles in audit, tax, legal, etc. so the salary averages on glassdoor, payscale etc. might be misleading for me.

Can anyone shed light on the actual difference? Thanks in advance.