DrAzzy:
It is expected that different boards will have different COM port numbers. This depends on which serial adapter the board uses and which port it's plugged into.Do you have the bluetooth module connected to the serial pins while attempting to upload? The serial pins are used for uploading so this can prevent uploading from working correctly.
I have the Bluetooth plugged in as per the instructions but I have no idea how the Bluetooth shield, motor shield and the UNO relate to one another as far as the serial ports are concerned. This stuff is way above me head. I got this kit to hopefully immerse myself deeper into the world of shields and Bluetooth.
Here's a link to the instruction manual. Hopefully that will provide clarity.