>Looks like some constants are repeated on this page...
>
>I think, we need COLOR_3DHIGHLIGHT 20 for fill color and I could not match the border color...

Yes, even in the .H file the constants are repeated, probably for future use or backwards compatibility, I do not know. This is the relevant portion of WinUser.h, there you'll see that some constants are defined as previous constants, hence the same value you are watching

#define COLOR_SCROLLBAR         0
#define COLOR_BACKGROUND        1
#define COLOR_ACTIVECAPTION     2
#define COLOR_INACTIVECAPTION   3
#define COLOR_MENU              4
#define COLOR_WINDOW            5
#define COLOR_WINDOWFRAME       6
#define COLOR_MENUTEXT          7
#define COLOR_WINDOWTEXT        8
#define COLOR_CAPTIONTEXT       9
#define COLOR_ACTIVEBORDER      10
#define COLOR_INACTIVEBORDER    11
#define COLOR_APPWORKSPACE      12
#define COLOR_HIGHLIGHT         13
#define COLOR_HIGHLIGHTTEXT     14
#define COLOR_BTNFACE           15
#define COLOR_BTNSHADOW         16
#define COLOR_GRAYTEXT          17
#define COLOR_BTNTEXT           18
#define COLOR_INACTIVECAPTIONTEXT 19
#define COLOR_BTNHIGHLIGHT      20

#if(WINVER >= 0x0400)
#define COLOR_3DDKSHADOW        21
#define COLOR_3DLIGHT           22
#define COLOR_INFOTEXT          23
#define COLOR_INFOBK            24
#endif /* WINVER >= 0x0400 */

#if(WINVER >= 0x0500)
#define COLOR_HOTLIGHT          26
#define COLOR_GRADIENTACTIVECAPTION 27
#define COLOR_GRADIENTINACTIVECAPTION 28
#if(WINVER >= 0x0501)
#define COLOR_MENUHILIGHT       29
#define COLOR_MENUBAR           30
#endif /* WINVER >= 0x0501 */
#endif /* WINVER >= 0x0500 */

#if(WINVER >= 0x0400)
#define COLOR_DESKTOP           COLOR_BACKGROUND
#define COLOR_3DFACE            COLOR_BTNFACE
#define COLOR_3DSHADOW          COLOR_BTNSHADOW
#define COLOR_3DHIGHLIGHT       COLOR_BTNHIGHLIGHT
#define COLOR_3DHILIGHT         COLOR_BTNHIGHLIGHT
#define COLOR_BTNHILIGHT        COLOR_BTNHIGHLIGHT
#endif /* WINVER >= 0x0400 */