Mornin' Bill, they are twist bits and they are exactly the same except totally different! (We have to be light today...the Huskers aren't playing too well right now). Seriously, the actual bits are indeed the same, the difference is the chucking styles. The "top" pic in your post chuck into the Jacobs style chuck on the drill, whereas the lower pic, chucks into the Centrotec style chuck.
There is no foam or "holding" elements for the loose bits, however, from Trev's pics, the Centrotec and the Centrotec Brad Pts are clipped in along with the Centrotec drivers.
Timmy C