They way I understand it if you have 419 stuff the only upgrade that the V3 would provide is the Bluetooth link which you can add to your V2.
My take on the V3 upgrade and I could have this wrong is that the maker of the whole package saw everyone replacing their parts with area 419 parts and tried to offer a product that can compete with the 419 package and increase their sales.
Again, I could have it wrong but the V3 seems to mimic the already available 419 parts