If it helps, I made an external tool that helps identifying stacks. As it's using the public data, there's no link with your profile or whatsoever.
For example, when you set the filter 'Stack Type' to 'Region' you will find a list of games that have a region stack, other then the 'Original Title'.
So, the first one is "50 Cent: Blood on the Sand (JP)", as it's flagged as a Region stack, there's also a 2nd (or nth) title available with a different prefix. In this case "50 Cent: Blood on the Sand"
If you have found a stack you're interested in, you can select this in the 'Cleaned Game Title' filter on the 'Information' page. If you then close the Information modal, the table returns a list of all stacks for the selected game.
The easiest way is to set the 'Stack Type' filter to every option except the one, that way, the list will already show you all stacks.
Here's the link:
https://app.powerbi.com/view?r=eyJrIjoiYmMzZTUyNWQtYzJlMS00M...