I assume you measured the frame rates and there was not difference between both? It's very possible your computer has side vents/air intake which means the temperature differences won't be as significant if it has a bottom air intake. However, I would not consider 0.5-1C "no difference". If a laptop is over heating, every little bit adds up to damage the unit over time. I usually see about a 1-3C difference just by ramping it up.
I'm wondering if the fan inside the laptop isn't strong enough to disburse the heat fast enough and part of the reason the temperatures are so similar. It's not completely guaranteed a laptop cooling pad can drop your temperatures, but worth a try.
But I guess I should ask. What temperature difference are you expecting? With a laptop cooler, I think you may see a 4-8C difference at best guess. I don't generally see more than that as the fans in a laptop and cooling pad (to be quiet) don't displace a heck of a lot of air.
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