It's similar, in the way a Ford Escape is similar to an Excursion. The basic principal is the same, but the scale is totatly different.
The A-10's gun is a big 30mm. Each "catridge" is about the size of a liter bottle, with the slug sticking out about the size of a small banana. Most of the ones shown in the video seem to be 7.62mm(x51 or .308 Winchester). The "slugs" the GAU-8 fires weigh about 2/3 of a pound. The Gatlings on other fighters are only 20mm. Even the 30mm mounted on the Apache fires a lighter round than the A-10's GAU-8. Only some anti cruise missile Gatlings, mounted on ships come close to the GAU-8, in fact some of them are GAU-8s in a different mount. :)
