As far as I know, Greg, nothing else changed around the battery carrier that would prevent the early carrier fitting to a later machine.
The reason they changed the battery was, I believe, one of capacity. I found while running my bike on very short, local shakedown runs of 2-3 miles that I could flatten 20 Ah of battery quite quickly, which means that you are pushing a heavy bike home; now that I'm doing much longer runs the battery is spending more time on charge, with the higher engine speeds and this has not happened since.
Of course, if you live in some wide open space, with hundreds of miles of roads available for biking, short trips may not be a problem!
As you will have seen from my blog, I have two batteries in parallel in the big GU11E battery box. The older carrier was not designed for this big battery, and you will need to use a smaller battery or battery box: I would look at some battery dimensions online and fit as large a battery as you can into the space you have.
It's also well worth fitting LED side and rear lights to reduce the current drawn.