Archie, himself, owed a lot to Andy Hardy.
In the vein of the Squadron Supreme and the Imperial Guard, there were a couple of other "unofficial" crossovers, with dopplegangers, for the other side.
Roy Thomas and Bob Rozakis (and, possibly, Gerry Conway) engineered and unofficial crossover with a group called The Crusaders, at DC and Marvel. In the Invaders comic, Roy introduced a team, called the Crusaders, who were modified versions of the Quality Comics heroes, who made up the Freedom Fighters, at DC......
Spirit of '76 is a stand-in for Uncle Sam, though the design is taken from Nedor's The Fighting Yank. Ghost Girl is the twin for Phantom Lady, Tommy Lightning is The Ray, Thunderfist is The Human Bomb, Captain Wings (taking the name of the Fiction House aviation hero) is The Black Condor, and Dyna-Mite is Doll Man. Meanwhile, over in Freedom Fighters, Gerry Conway introduced a team, called the Crusaders, who were alternates for The Invaders.....
Fireball was The Human Torch, Sparky was Toro, Rusty was Bucky, The Barracuda was Namor, and the Americommando was Captain America, though in actuality, the Americommando was a masquerade for The Silver Ghost, the enemy of the Freedom Fighters, who framed them for a crime, which made them wanted fugitives, on Earth-1. The rest of the Crusaders were comic fans (based on Len Wein, Marv Wolfman, Archie Goodwin and Roy Thomas), who were transformed by the Silver Ghost. The Marvel Crusaders were duped by a German agent.
A decade later, there was another unofficial crossover, between DC and Eclipse, involving the New Teen Titans and the DNAgents. The DNAgents fought a group from Project: Youngblood....
They consisted of Black Owl (Robin), Amazing Girl (Wonder Girl), Roboto (Cyborg), Heartstring (Jericho), and Celestia (Starfire) . There was no copy for Raven. Over in the Titans series, they ran into a grouop, called the RECOMbatants: Aurora (Rainbow), Dreadnaught (Tank), Topaz (Amber) and Pseudos (Sham). There was no counterpart for Surge.
In both stories, the other group is dying and it is only a matter of time before the end comes.