But those aren't equivalent roles!!
1.Public sector Nursing vs Private sector Veterinary nursing
You need five GCSEs at grade 4/C to get into nursing, so that's equivalent to a eg veterinary nurse in the private sector Similarly vocational, similar abiliy requirements and tasks. Personally I find human nursing slightly more valuable, but not everyone would agree!
Salary is broadly comparable, but definitely higher in the public sector nursing job. Plus that NHS pension of course...
A newly qualified nurse in the UK typically earns between £25,655 and £31,534 (Band 5), while experienced nurses can earn from £32,306 to £39,027 (Band 6). The highest earners include nursing consultants on Band 9, with salaries ranging from £93,735 to over £100,000 - a more specialist job than exists in the veterinary nursing role.
For a veterinary nurse, entry-level positions average around £24,000 to £26,000 and experienced nurses earn between £27,000 and £32,000. Senior roles and those in specialized or high-cost areas like London can earn more, with some experienced or senior nurses potentially earning up to £40,000 or more. They'd never get up to £100k: £100k is a top rate even for a senior vet after a 4-8 year Uni degree (which needs AAA A-levels to get into) and many years experience
2.Public sector politician vs Private sector investment banking
Investment banking is a totally different kettle of fish from either nursing or veterinary nursing! The banks hire the very best and brightest candidates: at least AAB at A level, 2:1 minimum from one of the better Russell group unis and some kind of personal edge that makes them stand out. They'll be working 60-80 hours in a normal week, and a 100 hour week isn't unusual when needed. (including all-nighters grabbing a couple of hours sleep in a meeting room, then continuing with another full day) .
They'll earn £30,000–£40,000 as graduates, £50,000–£70,000 after a few years and £150,000+ for senior roles,
That's reasonably equivalent to working as an MP. I know which I think are more capable and more useful...
3.Public sector CEOs (eg for network rail or Nuclear Decommissioning Authority) earn similarly to CEOs of equivalent private sector companies.