The Chain boxset: Alternate mixes?

[KenB]

The discography lists the following tracks on "The Chain" box set as either different edits or alternate mixes. For the life of me, I have trouble hearing the differences in some of the alternate mixes, like Second Hand News and especially Love In Store. Has anyone compiled a definitive list of what's different about each of these tracks? (For example: I think the acoustic guitar is mixed higher on Second Hand News, but I'm not sure.) I think a document of this sort would be very useful. Anyway, here's the list:

Isn't It Midnight
Gypsy
Second Hand News
Love In Store
The Chain
Dreams
Gold Dust Woman
Say You Love Me
Lay It All Down
Angel
Beautiful Child
Tusk
Need Your Love So Bad

The other thing I'd love to know is who sequenced these four discs, and why they did so in such a seemingly random way. Why is Lay It All Down on disc 3, when all the other non-LB&SN tracks are on disc 4? And why are the newly recorded tracks scattered around instead of all together? Does anyone have any info?