The spacial schism couldn't duplicate antimatter.
Two Voyagers.
One with antimatter, and one with out.
Firstly we followed the story of the ship with no antimatter where fetal Naomi died.
That's the fake ship.
On the Real ship, with antimatter, that was being threatened by a Kazon boarding party, real Kim, took real alive baby Naomi away to live on the fake Voyager, because she was innocent, and did not sign up for this shit, and apparently fake Janeway needed a replacement Kim, for the corpse she was mourning, rather than a second Tuvok.
Kim and Seven and Naomi were the only real people on the ship, by the time they got to Earth.
OR!!!!
The spacial schism destroyed the original Voyager and created two equally almost as good as the real thing Voyagers with corresponding not exactly authentic crew.
Nothing was real, and nothing matters after season 2.