The M-Unit Basic is the same as the M-Unit Blue without any of the Bluetooth capabilities and functions. The only physical difference between them is the M-Unit Basic will come with a red serial number sticker while the M-Unit Blue will come with a silver serial number sticker.
The mounting instructions will be the same for both m.unit versions. With more functions and better hardware the M-Unit Basic will be an excellent replacement for the m-Unit V2.
For more information and technical specs comparing the M-Unit Basic with the M-Unit Blue you can open the following document - M-Unit Basic Info.