differences

what is the differences between tuneboy & tuneecu//// I have tuneboy, are the cables the same

TuneECU works on a few different makes and models, but TuneECU is free and uses an inexpensive cable. The TuneBoy cable will work with TuneECU using the TuneBoy drivers, but not the other way around.

On that simlar subject will a tune ECU cable for a FI Bonneville work on the Roadster.

Yes. All Triumphs use the same diagnostic OBDII-style connector. You can even use this cable on Aprilia and KTM models with different adapters.
 
The TuneBoy cable will work with TuneECU using the TuneBoy drivers, but not the other way around.

But only the Tuneboy cable with USB connector. The TuneBoykabel with the old serial connector does not works with TuneECU.

BR, Tom