It's a lot better, but still not good enough;)
The main thing I'd be looking for is the power input part of the circuit. It's likely this consists of essentially a linear regulator and some filter caps, and not much more. At least that's what the photos you posted suggest; I see something that might very well be an LT1117 regulator. In this case, it's a matter of determining if the same regulator is present on both types of PCB's and what its maximum ratings and output voltage are. There's a good chance that in the fancy product the motors etc run directly from battery power and the rest of the electronics run at 5V or 3.3V supplies through the regulator, and that this part of the system is more or less the same in both types of product. But again, good photos of the internals of both products would be required.
Frankly, in your place I'd just drop the 5 quid a piece and start hacking 
Have fun!