The Planet referenced in FFVII
is Gaia. Beyond the brochure, which is an official SE document, one might note that the game includes a location called Gaea's Cliffs. Given that phonetics are all that's important in this case (similar situations would include Boko and Boco), it's understandable that this attests to the name of the planet.
More importantly, there's absolutely nothing in FFVII that suggests that the name of the Planet is not Gaia, nor that the game takes place in our future. I imagine you're thinking of the planets that appear during the animation for Safer Sephiroth's Super Nova spell, but really--that's entirely irrelevant. Besides being a matter of gameplay, the fact that the spell can occur multiple times (and destroy the same planets) suggests that it's somewhat illusory. Further,
our cannot actually go supernova, as it lacks the necessary mass.
Ultimately, Earth and Gaia are incompatible. We don't have a Lifestream, and we don't have materia.