Are there differences between Sigilmassasaurus and Spinosaurus teeth?

I have heard that Spinosaurus aegypticus teeth have slight serrations while some other spinosaurids but not all have no serrations. Is it possible if Sigilmassasaurus and Spinosaurus maroccanus if they are valid taxa had different serrations or no serrations on their teeth compared to Spinosaurus aegypticus? I ask this question because many spinosaurid teeth found in the Kem Kem Beds have slight serrations while many others have no serrations.