but why i can see little bit of orange color with shutter speed 1/400 ?
My best guess is that you had the camera set to automatic white balance (AWB). In the 1/200s shot, the moon was bright enough to easily be the brightest thing in the frame, and the white balance algorithm decided that that object was most likely to be white. In the 1/400s shot the algorithm chose differently. Maybe because the moon was only half as bright, it took a more evaluative approach and factored in all the blue light coming from the rest of the sky, setting the white balance more toward blue and turning the moon orange as a result.
Although the sky looks black in the photo, I bet it appeared more like a deep blue when you took these shots, right?