Hm, interesting idea. And a good chance for a re-read!
It strikes me that although superficially similar, they are fundamentally different because one takes place in the waking world, and the other in the dream world. Also, despite both being a form of self-defence, I don't think what he does on p383 is upsetting Tuuri because she think he's going to do himself harm, just that he's shutting down/shutting out the world.
I took Lalli's action on p864 as an act of desperation, the only way he could think of at short notice to stop Emil. Consider here,
http://sssscomic.com/comic.php?page=927, when he's developed a real friendship with Emil and really doesn't want to hurt him (perhaps also has learned a bit about seeing things from another's point of view, rather literally), and has had a little time to think up alternatives.
Clapping his hands over his ears is to shut out the world, and Tuuri is upset because she's seen him do it before, knows it means he's overwhelmed, that he'll be no use in that state,
and that it's her fault for yelling at him. Digging his luonto lynx claws into his scalp is to hurt Emil and break the hold the spirit voices have on him. I suppose attacking his/Emil's head makes it maximally disruptive to the mind control, otherwise he could just easily have clawed his arms, say.
Neat parallel, but my interpretation is that they're not closely related.