What's the Name of That Book??? discussion

I read this book in the early 2000s and at the time Animorphus books and Enid Blyton books were popular. The book itself may have been from the 90s.
The book is set in the future and it had the year in the title I think - 2020, 2030, or something similar. It was narrated from the perspective of three characters (I am guessing American)- the normal teenage boy who celebrates his birthday and receives a flying mechanical horse or something. He is being watched by his evil twin brother about whom he knows nothing. The evil twin is planning a doomsday to destroy earth or something. All the characters have shaved heads and trimmed nails as everything is connected to their DNA like ATMs. The third character is this young girl who lives underground on her own. She has long hair and wears a yellow jacket. She uses street smarts to steal from others without being caught.
The details are a bit hazy since its been a while.

I think I just came across this book at a book sale on the weekend! Is it Doomsday by John Peel? (aka "Fear the Year 2099" I think!). It is the first book in a series.

Doomsday (2099) by John Peel
https://www.librarything.com/work/994290
Looks like 2099 is the series name.
There is an evil clone.

Amazon's description of Doomsday by John Peel - SBC and bookel's suggestion:

"Peel (the Eerie Indiana series) debuts a futuristic, thrill-a-minute serial, 2099, that will attract computer buffs as well as science-fiction enthusiasts. This first installment introduces four key players: Tristan, a 14-year-old boy growing up during the height of the digital age; Devon, his desensitized clone; policewoman Taki Shimoda; and Genia, a crafty 16-year-old crook who resides in the Underworld. The "doomsday" nightmare begins when Devon, born and raised without human interaction, unleashes a computer virus that spurs a series of mechanical failures and mass deaths. Tristan (unaware that he has a clone) accidentally logs on to Devon's account, discovers the virus and temporarily stops it in its tracks. In doing so, he exposes his identity to Devon and places himself in grave danger. Enter Shimoda, who is determined to discover the root of the recent chaos, and Genia, who holds a vital computer chip that could either save or destroy the world. ... cyber-game of cat and mouse ..."