Only when halved along a line of symmetry.

A body cut in half at the waist, leaves you with two very different halves despite being the same length/height.

Cut in half along the spine though and you could have two equal, yet mirrored, halves.

With a long neck like a giraffe, half way down the length between the head+tail, one of those ‘halves’ is going to be much heavier/bulkier.