I actually found several of these comics uploaded to
http://www.simbas-pri.de. As far as I know, the comics that haven't been translated are:
"Auf eigenen Pfoten" (from the looks of the illustrations, maybe this comic could serve as an explanation why Simba beat up that gorilla in the TLK video game).
"Eine königliche Frisur" (yet another comic with Simon the monkey. There's also an adorable little creature that looks like a ring-tailed lemur in this one.)
"Zwei Sänger auf Tournee" (I tried translating this one, but I didn't have much success)
"Die Brücke am Fluss" (a one-page comic with Timon and Pumbaa)
And I found one somewhat amusing TLK comic page on the Outducks site:
Cub Simba, Timon and Scar in the same place and time. This is why some people don't consider the TLK comics "canon".