Appraisal results

I have a corporate job.
We had recently had a yearly performance appraisal. I got a good grade. However I cannot fully enjoy it considering that my peer received it too.
He was involved into less complicated projects and made a lot of drama (told to boss how hard he was working, how much he was struggling, how stupid all of our clients are etc.).
So now I understand that his results should not impact the fact that I got the same grade even by doing more complicated things. But I have thoughts:
1. “he will be recognized and promoted in the future by doing easy things”
2. “why should I work so much and receive the same grade and lower salary”
This creates fear and disempowerment.
Kindly ask you for your advice to cope with this.