Hi and welcome to the Frosty Rider snowboarding forums.
When you say, "Whats the difference between snowboard inside curves and measurements." I am not sure exactly what da heck you mean!  Can you rephrase your question?

Burton snowboards rock, no doubt.  The terms you are referring to are simply the titles for measurements that are taken on the board.  Here is the low-down on that for ya:

Overall Length - (or simply "length") Length of the board in cm from tip to tail.  Longer boards are for larger riders.
Running Length - The length in cm of the base of the board that actually contacts the snow.
Waist Width - The most important sizing factor.  Hold the board up on end and check out it's babelicious hourglass shape.  The measure ment of thenarrowest part of the waist across the base of the board is the waist width.  Riders with smaller feet look for a narrower waist width here (or smaller number) and big footers look for 26cm+.
Sidecut Depth - Tilt the board up on edge all the way 90 degrees.  See the gap between the floor and the center of the waist.  That is sidecut depth.  This is actually a combination measurement of waist width, nose width, tail width, and sidecut radius.
Sidecut Radius - If you had a giant protractor, you could actually draw the sidecut radius of your board.  Most are around 8 meters.  The larger the measurement here, the straighter the cut.  Lower numbers here equal tighter carves and lower speeds, higher for big long carves.
Stance Width - The range of possible width of space between feet.  Boards for smaller riders will have smaller values here.
Nose Width - The width of the widest part of the board on the frontend of the waist.
Tail Width - The width of the widest part of the board on the back end of the waist.
Effective Edge - When you flatten the board on the gorund, look at one edge.  The part of the edge that is touching the floor is the running length.  The longer the running length of the board, the more edge contact you have on the snow.  Riders looking to achieve higher speeds look for longer running length boards.
Stance Location - Typically is center in twin-tip freestyle boards or slightly back of center in freestyle/freeride boards.
Weight Range - Recommended rider weight range for use of that particular snowboard.

The waist of the snowboard has nothing to do with the waist of you.