PFA updated patch with new colors provided by Chethana, As discussed we will be using the same primary success color in both theme so we don't have add new variable.
No it is not, As per current dark theme implementation we have used primary color '#1a522b' for switch but the color you suggested is '#43A047' for both theme.
As per discussion with Chethana, We need to make switch box color change for light and dark theme, Color details provided by Chethana is updated on ticket.