Sorry I don't know what format the carbonite values are in, but if you can figure out how to convert them these are exact measurements from my map in yards:
Lua Code:
Pandaria x=8752.860352 y=6679.160156 width=15515.300293 height=10343.540039
Kun-Lai Summit x=4839.583008 y=5618.750000 width=6258.333008 height=4172.916992
The Jade Forest x=1452.083008 y=3652.083008 width=6983.333008 height=4654.166992
Vale of Eternal Blossoms x=2481.250000 y=1947.916992 width=2533.333984 height=1687.500977
The Veiled Stair x=812.500000 y=1689.583008 width=1793.750000 height=1195.833008
Valley of the Four Winds x=2679.166992 y=1095.833008 width=3925.000977 height=2616.666992
Krasarang Wilds x=2947.916992 y=-110.416023 width=4687.500977 height=3124.999992
Dread Wastes x=6139.583008 y=1416.666992 width=5352.083008 height=3568.750977
Townlong Steppes x=7079.166016 y=4558.333008 width=5743.749023 height=3829.166016
X and Y represent the top left corner of each map.
To get the percentage offset of kun-lai summit within pandaria you would do..
( 8752.860352 - 4839.583008 ) / 15515.300293 = 0.25222053522
or ( pandaria's x - zone x ) / pandaria's width = horizontal % offset of left edge of zone within continent.
It's possible you may not even be able to convert them to whatever carbonite uses, but here they are anyway.
Oh yeah, and the minimap textures themselves are just little squares that are placed next to each other in a grid like this..
I didn't think about it before but it's possible they're offset slightly from what they should be. From the description it's more likely just the maps though.