You can't just take someone else's clock numbers and use them. You need to tune your own clocks for your own card/mobo combination.
Actually, for clocks, you can. It has been demonstrated many times over that specific ratios at specific clocks, people reach similar sweet spots.
Where things vary a lot is with drivers/miner/thread conc/intensity/GPU thread. With those, you are on your own but still you should start with trying the common ones.