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Dr.Henry_Killinger said:

The only thing having the same architecture means is that they utilize the same instruction set in their assembly code. It has nothing todo with optimization or rather optimization for hardware.

The reasoning for the engine being "CPU bound" doesn't make any sense, unless its developed for/optimized for the XB1. 

EDIT: Especially since you're first sentence is completely invalidated by the second sentence. If no optimization was needed then performance would be at parity. The engine performs better on the platform with a faster CPU despite having the same architecure hence a contradiction. The architecture being doesn't mean anything with regards to optimization, just the instruction set it uses.

There's no contradiction; Xbone has a faster CPU, therefore a CPU-bottlenecked engine runs better on it. Xbone/PS4 are so similar that it shouldn't matter which is the lead platform.