Further tests & examination of the JP laserdisc image shows pools of flattened areas in that problem blue channel. Most of the detail is plain missing. With that, I’d say there is no way to fix that blue channel enough to allow JP to color match UK.

One idea that might work is to recreate JP's blue channel with UK's blue channel … using DrDre's statistical color matching algorithm (in the Star Wars Preservations and Other Fan Projects forum) on individual B&W RGB-extracts (if it will work well or at all with damaged picture areas). If it can work, perhaps all the channels, either individually or together, can be processed for a close match of color distribution. But I’m not set up to test something like that.

Any takers?