In CSS, none & hidden border styles are equal or not?

Question

https://code.sololearn.com/WQo3ThlUy2qJ/?ref=app

Answer 1

They are visually the same only if the border width is zero ( or undefined ), else 'hidden' is equivalent to set a border color to 'transparent' value: the border is not visible but space required for its width is reserved on display, while 'none" will not display the border and NOT reserve space for it ^^

Answer 2

no they are not equal but visually they are same.

hidden means no visible border.
none means no border.