The picture in DATZ of L427 (which is correct - it's from the trip that Ingo and Andi made in Northern Brazil) doesn't look like L600 to me. P. leopardus ("L600") has a different range, is flatter and doesn't have larger spots on the head.

Jools
Agree, they looks different.
I have one question ...

The fish most of europe and the US calls L600 is does not appear to be the range restricted L427 but perhaps you meant to say the fish shown in this thread is L427?

I am a newbie in pleco, you can see I just registered today... So I don't have any my opinion, and I don't believe people told me ...

Some liar invent L600 to represent "better than L114", the REAL L600 will appear in the future, I guess 2018~2020.
The fish you call L600 is L427.