I'll jump in here
The physical chips are the same as you would buy from any diablo dealer. The difference is what is on the chips. Think of a chip as just a method of holding the programming. If you ordered a diablo chip from just about anyone out there, you will recieve a diablo chip with a diablo program.
Diablo offers blank chips to independant tuners, and that's what Apten uses. They take the blank chips and write their own programs on those chips. The difference is in how your vehicle reacts with each chip. Although they look the same, Apten uses their own transmission programs, fuel tables, spark input, adaptive learning strategies, and other various functions. Some of the programming may be similar to what you would get in a standard diablo program, but some is very different. Apten doesn't actually get any data or programming information from Diablo.
Another thing Apten does is write a chip program specifically for your vehicle. They can use the chip program to compensate for different size tires, different gears, custom camshafts, superchargers, nitrous, or other modifications. Plus you can choose if you want your performance program to run off 92 or 87 octane gas.
So the main difference is how the program works, and the other thing is that you get your own program written for your own needs.
Brian