Spider-Noir is a departure from the Spidey we know and love, which is only possible through the multiverse.
But, while we first saw Spider-Noir in Spider-Man: Into the Spider-Verse, this isn't the same version of him (even though they're both played by Nicolas Cage). That version of Spider-Noir was an alternate Peter Parker, but this version is Ben Reilly, a private detective in the '30s.