that's probably the case. The connectors are quite distinctive, 3-pins go with 3 pins etc. The power lines, motor, brake lever sensors, LED panel are all terminated with matching connectors. The difficult bit is only the pedal rotary sensor. You don't have a throttle and speed sensor with this kit so there is no confusion because they have 3-pin connections.
It does not hurt to ask their support department to confirm the colours of the wires.
Install in order:
1. Install the battery
2. Install the motor
3. Connect the LED panel, battery and motor to controller
Switch on the electrics (red button on the 790 LED panel).
If it lights up, continue.
4. Install the pedal sensor
Test the bike on stand
5. Install the brake levers
Test the bike on stand.
That's it.