:Count is 0 vs :Count "Is Empty"

Are those returning same results? or they serve different functions?

They have different functions.

:Count is 0 means that, only when the number that is in cell is 0
:Count is empty means when there’s no value, empty.

So if you do only when count is 0 and there’s a empty value, the action will not fire and vice versa

You can also use “less than” or “greater than” 0 as a math expression to trigger both functions.