I disagree.
Their methods of attack and scale damage are on 2 completely different sides of the scale.
Susanoo deals in personal attacks, small scale damage and is nowhere near as flexible/motion able as Kuramas Avatar. It's a stationary attack for the most part, not completely though. It also uses weapons and items, and most users use it for destructive purposes for taking advantage of the environment.
Kuramas Avatar on the other hand is extremely mobile and quick, deals destructive blows, uses only a single long range attack and deals in combat through its own body.
Not to mention, Susanoo only has room for 1 user, we're not even sure how those chakra properties would react to another being inside of it... For all we know it could burn them alive. Kuramas avatar on the other hand heals people and carries them.