so where do you see the "exact model of CPU & dGPU" there ?
Other than being of the Skylake generation, there is no 'exact' CPU model-step number of the i3, i5, or i7 processor, or GPU, given (yet). But then the Surface Pro 4 itself is not available yet either.
Besides, does it matter? You are unlikely to be able and exchange the processor yourself (iFixit hasn't dissected one yet, and others also have limited low level details), and Microsoft only offers a choice between some selected combinations of processor, memory, and storage. So one is more likely to choose the model based on application, or budget, not on specific processor model code.
Also, comparing processors without the rest of it's support electronics is rather meaningless.