If the original creature had a characteristic-defining ability that determined its power and/or toughness, that ability is not copied
The fact that these two cards rival each other is a possible reference to the original Yu-Gi-Oh
If I happen to have Nissa's Chosen in play and it dies, then there are two relevant replacement effects: Stone of Erechs (that would exile it instead of letting it go to the graveyard), and Nissa's Chosens own replacement effect (that would tuck it back into my library)
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For example, the base set cards I just finished took me about an hour each due to the art style and the shading because they were both difficult to match
The remaining cards from that same batch, left without the stamp, are what collectors now call Shadowless