X201 and X201s motherboard compatibility

[L29Ah]

My X201 died recently (it seems like there is a shorted circuit somewhere in the primary power supply circuit, a dead PMIC/MOSFET or so), so i wonder if i can buy a X201s motherboard on ebay and just replace the dead one with it. Any ideas?
Also does i5-520UM consume a lot less power while idling than i7-620LM? Too bad all the ULV i7 X201s's are gone.

[blank001]

Why not just grab another X201 motherboard?

[EOMtp]

@L29Ah: Answer to first question: Yes. Answer to second question: No.