Any place where it says וכפר ונסלח (make atonement and be forgiven) (and placement of blood is mentioned in the chapter, so there is no need to say וכפר with respect to the sprinkling of the blood) - then the verb וכפר will be superfluous, since סליחה belongs in the category of כפרה, and it will always come with a homiletical interpretation.

And the sages will interpret that it teaches that it atones even when one misses a certain detail in the sprinkling.

On the contrary, any place where it does not clarify that there is to be a placement of blood, the wordכפר with respect to the sprinkling of the blood will be necessary for the matter itself.