It’s impossible! Oda confirmed the ages and birthdays of both:
Law was 24 years old before the timeskip – his birthday is October 6th
Sabo is the same age as Ace, who was 20 before the timeskip – Sabo’s birthday is March 20th
A 26year old Law cannot be the same person as a 22year old Sabo!
Additionally, Oda was asked to draw Trafalgar Law as a child (seen above), and Law looks nothing like Sabo.
At the latest after reading chapter 744 it should be clear, that Law is not Sabo:
Source: SBS Vol. 59 – Oda states Law’s birthday, SBS Vol. 60 - Sabo's birthday is revealed, SBS Vol. 68 – Oda states Law’s age, One Piece Green, Chapter 744 - Sabo's face & rank get revealed
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