The laws of science and nature work the same in both universes.
Of course, these are *comic book* laws of science and nature.
Yay! Lois has finally got her Clark, and Clark his Lois! Lex is left with an officially dead wife, and Superman has been reunited with his betrothed-at-birth-wife, Ultra Woman!
Well done.
Although Lois had to give up:
1) The baby
2) Her name
3) Her previous life as an ace reporter.
So this transformation was not without cost.
