AA_Compara digitos

  int KHex = K + (6 * (K / 0x0A));
  int MHex = M + (6 * (M / 0x0A));
  int KH = KHex >> 4;
  int KL = KHex & 0x000F;
  int MH = MHex >> 4;
  int ML = MHex & 0x000F;

  if (K == M) X = 10;
  if (K != M )
  {
    if ((KH == ML) && (KL == MH))  X = 9;
    else if ((KH == MH) || (KL == ML) || (KH == ML) || (KL == MH) )  X = 8;
  }