I'm not sure, given my understanding of your circumstances, that I'd use a resource pool to meet the requirement you show above. You may have other (quite valid) reasons for the pool but for the purposes of this answer, I wouldn't go that way.
Open a clean project
Insert > Project and open (I'd "link" to the project)
Repeat for the other projects
As much as I like WDWW, I couldn't easily find a way to modify it to make it work so that it will generate the consolidated info you want.
I looked at WDW, and I included the Project name field in the display and it "sort of" works but it gets messy very quickly.
So ... what to do?
View > Resource Usage
Project > Group by > More groups... click on the New button
Name: PDQBach
Group by: Name, Resource, Ascending
Then by: Project, Resource, Ascending
Click on OK, click on Apply
On the Formatting bar, click on Show and set to Outline Level to:
Level 1. You'll see a summary for each resource
Level 2. You'll see the resource and the project(s)
Level 3. You'll see the resource name again but, if in red, then there is a possible overallocation.
The only tough bit (not so tough, really) is to "consistify" the resource names so that you use the same spelling in each project. Although a resource pool will *generally* force that, it brings some additional baggage and potential for issues that -- if you're just trying to get the result I've described above -- I would avoid but, as I said earlier, if you have other requirements that can only be met with a Resource pool then you can use that approach.