I assume you mean figure 9 on that page?
If so, then there's no real difference between that and the wikipedia page as such, your link perhaps shows a bit more clearly that the amino ketoester could come from the same molecule as the ketoester, and so the substituents at 2 and 4, and at 3 and 5 can be the same, but I don't think that's a rule as such - it may be but it may mean not a Knorr as such, I'm not fully conversant with names and tend to try and remember basics of mechanisms themselves.
The basic picture I would draw if asked to describe a Knorr would look pretty much like figure 9, perhaps without the chirality in the last intermediate or the amine, as I don't think they're relevant to the final compound.
S