PEB ProcessParameters on different OSes

Does anyone know if the ProcessParameters (RTL_USER_PROCESS_PARAMETERS) member of PEB (PEB+10h) have the same structure on different OSes (NT/2k/XP/2k3)? I don't want my code to break with false assumptions

On 2k it's like this:

typedef struct _RTL_USER_PROCESS_PARAMETERS {
	ULONG MaximumLength;
	ULONG Length;
	ULONG Flags;
	ULONG DebugFlags;
	PVOID ConsoleHandle;
	ULONG ConsoleFlags;
	HANDLE StdInputHandle;
	HANDLE StdOutputHandle;
	HANDLE StdErrorHandle;
	UNICODE_STRING CurrentDirectoryPath;
	HANDLE CurrentDirectoryHandle;
	UNICODE_STRING DllPath;
	UNICODE_STRING ImagePathName;
	UNICODE_STRING CommandLine;
	PVOID Environment;
	ULONG StartingPositionLeft;
	ULONG StartingPositionTop;
	ULONG Width;
	ULONG Height;
	ULONG CharWidth;
	ULONG CharHeight;
	ULONG ConsoleTextAttributes;
	ULONG WindowFlags;
	ULONG ShowWindowFlags;
	UNICODE_STRING WindowTitle;
	UNICODE_STRING DesktopName;
	UNICODE_STRING ShellInfo;
	UNICODE_STRING RuntimeData;
	RTL_DRIVE_LETTER_CURDIR DLCurrentDirectory[0x20];
} RTL_USER_PROCESS_PARAMETERS, *PRTL_USER_PROCESS_PARAMETERS;