Both LED packages (referring to the chip) would have three emitters (RGB). The new one just has a frosted lens instead of a clear lens which probably helps blend the color a little better. Can’t really tell if the actual emitters are smaller or just more closely packed in the chip.
It’s good to know they are potentially dimmer though, still running my original 7.5v boards but almost always have at least one GI wigging out on me. One day will have to bite the bullet unfortunately.