Yes and no. The Big Time uses the old Apex Adrenaline core (I believe) which has a pancake on top, where as the Energy used a flip block. Also the Energy has a smaller "power cap" on the bottom of the core as well. The Big time does not. ALso on the BT the bottom portion of the core has a small piece cut out so to speak, where as the Energy is round all the way through. Several minor differences in cores. Coverstocks are obviously different. 2 cores that are truly similar are the Track EMB and the Roto-grip Rush. Those two are very similar in look, but once again have some differences as well.
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And then this one time...at band camp...