Not much other than the NRF24L01P adds built-in control for VESC and MPU9150 is the accelerometer. I’m not if Trampa sells the VESC with both of these.I read on the VESC forum that the NRF chip is not included due to certifications with the FCC cause it operates in the 2.4 GHz spectrum for buyers outside the EU. Tramp sells two different version for EU and Non-EU regarding this chip. The other thing, Vedder used the current sense amplifier for the DRV8302 on HW 4.12 and not on the DRV8301. I’m assuming it because the chip only allows for 2 amplifiers and it’s not good enough. I just learned TI has the DRV8323R utilizing the SPI interface found in the VESC6.4 and 3 current shunt amplifiers. The buck converter, however, does only 600 mA versus the DRV8301,1.5 amp supply.
Cost wise, the BOM for HW4.12 is ~$75 versus HW6.X at ~$100. It 50/50 for me; my call if I need to. Price-wise, cheaper wins for the consumer as the general consensus. I’m not cheaping out on my version.
I’m not an EE. I got a chemistry degree. This is all a hobby/education into what the world is moving towards.