Laplacian & High-Pass filters : (a) VS (b)

Good Morning,

I’d like to understand the difference between the filters called “Laplace 3x3 (a)” and “Laplace 3x3 (b)”.
The same question for “High-Pass 3x3 #1” and “High-Pass 3x3 #2


The kernel is is different in both cases. If you click on image you will see the weights of each kernel.

Thank you marpet, I didn’t get attention to that tool. Thanks a lot ^^