[OS X TeX] Spotlight TEX and PDF

[RA Friedrich Vosberg]

Morning.

I want to create a smart folder in Finder.app that includes all TEX  
files and their respective PDF files. So in human words the search  
criteria would be:

Find all files with the extension TEX and all PDF files with the same  
file names like the found TEX files and list them both.

How should I translate this query to be understandable for the  
Finder.app?

TIA and kind regards, Friedrich