The JPG title is not a part number, therefore it would need to be Parsed and matched within FMP script programming.
Manually inserted letting the USER do the matching for each record.
Use Import Records | Folder to import the images into a separate table.
Import the filename into a text field.
The inclusing of .jpg as part of the file name keeps 554634-1.jpg from matching to 554634-1 as the text isn't exactly the same.
But you can define a calcualtion field as:
Left ( fileNameField ; Length (FileNameField ) - 4 )
to get just the name and no file extension.
Then you have a pair of fields that can be used to match records in a relationship to get the right picture file assocated with the right part record.
Thank You both, for the quick reply, I will be working on that script this weekend, much appreciated.