Of course they are. It's pretty clear Oda's intention with Sabo was to showcase to the readers how strong Ace would have become. That's why he made them almost dead even as children. Then he gave Ace an OP Devil Fruit, and made Sabo a haki beast, and then gave Sabo that same OP devil fruit. EoS Sabo = what EoS Ace would have been had he still been alive.
without even mentioning as a kid he had already showcased conquerors haki .
in 2 years I strongly believe he would be as strong as luffy is rn if not better.