What Timmy said basically lol, newer = MOAR POWAH!
In most cases indeed, howevs not always since were comparing an older quite powerful desktop GPU to a newer laptop GPU, while the specs on the laptop GPU is newer and it's desktop counterpart is a good mid range card for those wanting high performance for a reasonable price, I still have alot of experience with laptops being slower than desktops, despite having fairly high specs.
But I stick to what I say, I doubt you'll be disappointed with the video card on the laptop, if anything will bottleneck it, it'll be something else as mentioned.