It is hard to say and depends on the culture of your institution. But I think it more likely that you would do worse by making any formal complaint than otherwise. You might even be laughed out of the department head's office for making a complaint. But who can say. Professors are pretty independent in such things, though sometimes they do try to coordinate the workload if nothing else.
And what would you hope to accomplish? Toughening up the other section? Getting one of the professors disciplined? Switching in mid stream?
Being loved by some students and professors and hated by others? Lots of possible outcomes here.
And few of us from this distance can say if the "tougher" standards you might be facing are an advantage for you or a disadvantage. If you meet a high standard you learn more.
Being a tough instructor is different from being an incompetent one.
And, a secret. Some professors seem tougher than they are, making adjustments when it comes to final grades if the overall distribution of grades is too low.
I guess my best advice is to grumble to yourself if it helps, but use this as an opportunity to improve your understanding. Especially if this is an important course.