Source: Superboy Special vol.2 #1 (1992)
Type: Alternate Earths
I mean, Superboy has to use the portal because a terrorist has died and that has triggered the countdown to a whole slew of disasters. Clark has to find another version of the terrorist to show off to the media so the guy's sleeper agents won't pull their various switches. He fails, but connects with an alternate Superboy he's happy to see is a hero. A hero who's just killed a Central American dictator! Oops! Clark asks where HIS rocket fell, and alt-Clark answers "Brooklyn", which is why he says things like "youse". I don't know what writer Stan Berkowitz (who wrote for the TV show and later the Animated universe) is trying to say there. That people from Brooklyn are more likely to kill than people from Kansas? That's not right, is it? (There's also an innocuous but vicious line about hostages and the Middle East... I'm going to say Mr. Berkowitz is a bit tone-deaf and leave it at that.)
Anyway, Superboy still enrolls Brooklyn Superboy's help and then a whole mess of others arrive (above). Swan isn't into major redesigns, so it's mostly about haircuts and "S" symbols. (The El family crest is an odd point of divergence to be that common). Together, they stop all the terror-created disasters around the world and go back to their own Earths. Except Brooklyn, who decides to help Clark with another Silver Age problem. Seems that Lana saw him change into Superboy, so now he needs a body double to get him out of this secret identity snafu. Except Brooklyn kinda wants to use Lana's attraction to Superboy to get jiggy with it, uhm, her.