Yeah its a never-ending learning experience!!
I also collect SSC Galactica, and the differences u see on the Argie Jsulc releases is cause there were 3 releases of them, the ones that are different from the rest is the 1st release (came out boxed). 2nd release came out boxed as well and they are different from the 1st release. 3rd release where the remnants of the second release and they came out in bags and also in blisters with some furniture.
You also have the Cromy releases that were the very first argie ones and they are completely different.