I didn't know that about the 5300ce screen.  The Kanga and 3400c cases themselves actually aren't all that compatible (those things on the sides for instance); I never actually compared the sizes - or noticed, that's interesting.  But yea inside its' very obvious.  Although interesting Apple's manual doesn't make it very clear which parts are cross-compatible.  The manual is the same for both but some of the parts in my Kanga have different part numbers.