script to rename files that have similar names?

Hi, folks.

I have my  RAW files in one folder and my derivative images (e.g., PSDs, TIFFs,  JPEGs) in another.  The derivative files only share the last four digits  of the RAW file names (e.g., the RAW file is named 100826-14278.CR2 but  the JPEG version is only named 4278.JPG).  Also, the derivative files  have no metadata.

Is there a way to use a script to match all the  derivatives to the RAW files based on the last four digits, then change their file names  to match the RAW names.  And, if that’s possible, can Bridge then  cascade the metadata minus the camera data EXIF from the RAW files to  the derivative files?

Thanks!

-Greg

P.S. My knowledge of scripting stops with cursive handwriting, so please be gentle.