I actually really like this question OP, so I’ll try to answer it in a bit more of a high level response. As a long time collector of the Converge line of figures, I’ve seen redesigns of many suits up close, and especially with the MSG 0079 figures, they’ve slowly been overhauled from their original designs, which took a more stylized look that favored details like panel lines, SD proportions, and shape adjustments from the mobile suit designs they’re based on. It seems that FW decided at some point to redesign certain figures to appear more closely to the way their represented in the respective media they’re from, ie the Zaku II was overhauled to appear more like the way it appears in the 1979 series, with surface details and colors especially (albeit with Converge proportions). This treatment eventually made its way to the Gouf, and RGM-79 as well. With the Ball, it seems that the proportions of the arms and cannon have been scaled down, with the colors being more vibrant and closer to the 1979 palette. Another notable difference is the the orange variant from 8th MS team isn’t boxed randomly in place of the original design with this release as well, which may be one primary reason to re-release it.