The Guggenheim Director makes $850k.[0]
The Tate Modern Director "earns between £110,000–115,000 ($148,000–155,000)"[1]
They do differ in public funding, but the philosophies between US and European museums are fundamentally different.
[0]https://www.theartnewspaper.com/2021/12/21/guggenheim-direct...
[1]https://news.artnet.com/art-world/tate-denies-gender-pay-ine...