I wondered that as well. It's possible, given how similar the format. But it seems it would be mentioned on the sites. As in, "If you don't see what you want, check our sister site, at:" or some such statement.
§467. I am sitting with a philosopher in the garden; he says again and again “I know that that’s a tree”, pointing to a tree that is near us. Someone else arrives and hears this, and I tell him: “This fellow isn’t insane. We are only doing philosophy.”
― Ludwig Wittgenstein, On Certainty