No not necessarily. Let me go over some scenarios:
Bob contributes 1. I contribute 1.25. Units don't matter, I contribute 25% more.
It used to be maybe the salary band is $100k to $130k. Bob gets $100k. I get $125k. My employer gets a total value of 2.25 for $225k.
Now my employer has to disclose salaries and has 2 options:
1) Don't make out salaries the same, Bob quits, now the employer has only 1.25 when they need 2.25 and have to go re-hire ($50k or more in a lot of times).
2) Make our salaries the same, so now Bob also gets $125k and employer pays $250k for 2.25. This is what will happen in the short term and what attracts people, but in the long term what will happen is
3) Make our salaries the same but slow raises so gradually they go to the inflation indexed amount of about the average, so $112.5k more or less. Now employer still pays $225k for 2.25. But now I am subsidizing Bob the less productive worker for $12.5k every year.
A lot like unions, making things more uniform often comes at some expense to the top performers. I always sit near that top so I say no this is stupid and I hate it. I don't give a shit what Bob is paid and I give even less if it costs me money for him to get more.