That was basically IDW1, though they never interacted.
Galvatron (who was a separate character) was basically leading the Decepticons on Earth while Megatron had turned Autobot and was hanging out on the Lost Light.
I was reviewing those comics for this site at the time. I remember.
Regardless it doesn't really fit what I'm talking about on multiple levels.
One, I'm into the idea of a Jekyll and Hyde situation where a reformed and sincere Megs and evil Galvy are one and the same being. IDW making them distinct misses that point entirely.
Two, I specifically mentioned Earthspark Megs because I think of the two "good Megatron" takes we have his is the easiest to get behind. We don't know much about the Autobot/Decepticon War in ES' continuity which makes it easier to fill in the gaps in a way to make "good guy Megatron" work.
In IDW 1.0 Megs is specially mentioned as being a Cybertronian supremacist despite his "workers' rights" beginnings, and his Decepticons waged wars of genocide against countless organic species over the course of their war with the Autobots.
Oh, and IDW 1.0 Megs had an Auschwitz parallel death camp. As a Jew that symbolism hit VERY hard.
IDW 1.0 Megs was basically Space Hitler. And it made his "redemption" seem pathetically tone deaf. I don't care how many sads he got from the blue flowers, this dude doesn't deserve the wooby uwu he's sorry arch.
So if the idea of "Megatron reforms, sincerely joins the Autobots but has a darker side that manifests as a separate Galvatron persona he's unaware of" is to work we need to buy Megatron as a good guy.
So more Earthspark Megs and less IDW 1.0 Megs.