You can filter your pull requests based on the commit SHA – see here
If you know the specific SHA hash of a commit, you can use it to search for pull requests that contain that SHA. Note that the SHA syntax must be at least seven characters.
For example:
e1109ab
Matches pull requests with a commit SHA that starts withe1109ab
.
0eff326d6213c is:merged
Matches merged pull requests with a commit SHA that starts with0eff326d6213c
.