Because the game will count it as a completely different object
All of this isn't an argument against Modern Horizons
6 Maralen Of The Mornsong Changes Card-Drawing Forever If Winter Orb interferes with the untap step and Paradox Haze replicates the upkeep, then it's time for a card to change the rules for the draw step, too
It was a perfect card for the Domain archetype and ended up having a breakout moment winning a Pro Tour in a finely tuned Domain Control deck
I misread your question and thought you were asking why they are different, but anyways haha We dont really know for certain, but its probably because whatever processes, texture files, and or tech Japan/TPC uses for texturing are different than the ones TPCI uses
If necessary, Magneton can also fight back with 60 damage using its Move, so it isnt helpless either