Inconsistent TEB definitions

While implementing service tag support in advapi32 I felt on something really weird.

I set service tag that way:

    /* Set service tag */

    Teb = NtCurrentTeb();

    Teb->SubProcessTag = (PVOID)ThreadParams->dwServiceTag;

Then, in advapi32_apitest, I read it that way:

    Teb = NtCurrentTeb();

    service_ok(Teb->SubProcessTag != 0, "SubProcessTag is not defined!\n");

The test works fine in W2K3 SP2, but fails in ReactOS, in spite of my code properly setting it.

Reversing both advapi32 and advapi32_apitest built with GCC Lin shows that:
advapi32 modifies:

7c47be64         mov        esi, dword [fs:0x18]

7c47be6b         mov        edi, dword [ebx+0xc]

7c47be6e         mov        dword [esi+0xf60], edi

advapi32_apitest reads:

0040f828         mov        ebx, dword [fs:0x18]

0040f82f         mov        esi, dword [ebx+0xf64]

Either we have a major build issue, or, we rather have a TEB definition issue.
Whatever the reason, advapi32_apitest is right. SubProcessTag is at offset 0xf64, hence the fact the test works on W2K3 SP2.