Yep, the Kindle, Sony, Nook all use the same screen, all made by the same manufacturer. There might be slight differences in how they are coated, and there will be slight differences from unit to unit, but they are all essentially the same. If you need a light for one, you would need a light for all.
If you find it dark for reading, I suggest the Kindle lighted cover. I use mine daily on my K3.