StatusStrip transparence more than toolstrip when both's BackColor set to transparent and the form's backColor set to color with A value

Question

I have some toolstrips and StatusStrip and i already set

SetStyle(ControlStyles.SupportsTransparentBackColor, true);

But when i set backColor for the Form with A value for example: Color.FromArgb(170, 96, 72, 225) i get that the StatusStrip is more lighter than a toolStrip. Check this image:

What is the reason of this?

Can i set both toolStrips and StatusStrip to same color(transparency)?