I'd say it's not the same. A bow that is built for a draw length of 29" needs to have longer limbs than one that is built for a draw length of 25" if you want a nice and smooth draw without stacking until the end. The longer limbs also needs to be thicker to get the same draw weight. These limbs will have more mass and therefore the performance will be not so good. To get the best performance out of a bow it should be built in a way that you can draw it 1 - 2" over the specified draw length without stacking.
Hope I could make my point clear.
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Andy