Don't know I really understood your problem ...
Yes, you can search on name mapping tab. Open Name mapping tab and click Edit at top menu then find...
But you have to remember what you have mapped at least part of mapped name.
In Object browser it shows the current snap shot of objects
Since this object mappings are currently mismatching, you wan't be able to find in object browser.
best thing would be
1) go to your script and get what old name
2) search it in name mapping
3) change name mapping as to match new object property
