According to BCP there is only one parallel. The base set notes
"Each 21st Century Phenom has two versions: One an "action" card with a purple background, and the other a "portrait" card with a blue background. Both cards are serial-numbered to 625 copies and are both considered "true" rookie cards."
Whereas the one parallel is Orange and is numbered to SN950.
My guess, based on when checklist was uploaded, the person didn't do proper research or ask questions and created these sets for their own collection. Reconciliation will be needed.
Edit: Link added
2002 UD A Piece of History - BaseballCardPedia.com
My sins have come to face me, I can feel it
That I have lived my life in vain
And now I know I'll reap the seeds I've sown