Here’s the rub: “same job”.
Sure, this is a reasonable attitude to take if it’s genuinely the same job and each worker is creating genuinely the same value.
But everywhere I’ve worked, comparable jobs are defined as graded job families, and it has been very obvious that there is a diverse range of work being done within a grade/job family, with individuals bringing a diverse range of experience, skills and performance.
For two individuals to have the “same job” is a rare thing in knowledge work.