apple butter canning recipe.

Hi everyone! I am new to canning. I have canned apple pie filling with the ball apple pie filling recipe. But now I am trying to figure out a good apple butter canning recipe. My grandpa really loved apple butter especially from apple hill and I am trying to find a recipe that is exactly or sort of like it. I also wanted to know why 2 of these recipes rant safe to can? because aren't apple naturally acidic? Why wouldn't any certain apple butter recipe work?

Here are the four I was looking at.

https://foodinjars.com/recipe/spiced-apple-butter-giveaway/

https://www.ballmasonjars.com/blog?cid=apple-butter

https://www.mybakingaddiction.com/crock-pot-slow-cooker-apple-butter-recipe/ (the one I think is similar)

https://nchfp.uga.edu/how/can/canning-fruits-and-fruit-products/apple-butter/