[Vinolentus]

удаление объекта 1 с карты А ни коим образом не влияет на объект В с таким же гуидом на карте 2.

Если они временные. Посмотрите на mGameObjectDataMap и mCreatureDataMap. Они глобальны в той степени, в которой могут быть глобальны переменные одиночки-ObjectMgr'a. Ключ - guid %)
Или, например, сюда:

void GameObject::SaveToDB(uint32 mapid, uint8 spawnMask, uint32 phaseMask)
{
    const GameObjectInfo *goI = GetGOInfo();

    if (!goI)
        return;

    // update in loaded data (changing data only in this place)
    GameObjectData& data = sObjectMgr.NewGOData(GetGUIDLow());

    // data->guid = guid don't must be update at save
    data.id = GetEntry();
    data.mapid = mapid;
    data.phaseMask = phaseMask;
    data.posX = GetPositionX();
    data.posY = GetPositionY();
    data.posZ = GetPositionZ();
    data.orientation = GetOrientation();
    data.rotation0 = GetFloatValue(GAMEOBJECT_PARENTROTATION+0);
    data.rotation1 = GetFloatValue(GAMEOBJECT_PARENTROTATION+1);
    data.rotation2 = GetFloatValue(GAMEOBJECT_PARENTROTATION+2);
    data.rotation3 = GetFloatValue(GAMEOBJECT_PARENTROTATION+3);
    data.spawntimesecs = m_spawnedByDefault ? (int32)m_respawnDelayTime : -(int32)m_respawnDelayTime;
    data.animprogress = GetGoAnimProgress();
    data.go_state = GetGoState();
    data.spawnMask = spawnMask;

    // updated in DB
    std::ostringstream ss;
    ss << "INSERT INTO gameobject VALUES ( "
        << GetGUIDLow() << ", "
        << GetEntry() << ", "
        << mapid << ", "
        << uint32(spawnMask) << ","                         // cast to prevent save as symbol
        << uint16(GetPhaseMask()) << ","                    // prevent out of range error
        << GetPositionX() << ", "
        << GetPositionY() << ", "
        << GetPositionZ() << ", "
        << GetOrientation() << ", "
        << GetFloatValue(GAMEOBJECT_PARENTROTATION) << ", "
        << GetFloatValue(GAMEOBJECT_PARENTROTATION+1) << ", "
        << GetFloatValue(GAMEOBJECT_PARENTROTATION+2) << ", "
        << GetFloatValue(GAMEOBJECT_PARENTROTATION+3) << ", "
        << m_respawnDelayTime << ", "
        << uint32(GetGoAnimProgress()) << ", "
        << uint32(GetGoState()) << ")";

    WorldDatabase.BeginTransaction();
    WorldDatabase.PExecuteLog("DELETE FROM gameobject WHERE guid = '%u'", GetGUIDLow());
    WorldDatabase.PExecuteLog("%s", ss.str().c_str());
    WorldDatabase.CommitTransaction();
}