Not exactly. Although you will get the same outcome, with four disks running, you are four times as lkely to have a disk failure. Granted you will rarely have a 4 disk spanned RAID setup, you get the point. With RAID 0, you are twice as likely to have a disk failure. If you do RAID 0+1, you are safe, because upon failure of a disk, the same information is stored on another disk, so no worries.
All of this sounds bad, but think about how rare a disk failure is. Say a disk failure chance is 1%. In RAID 0, you would have a 2% chance of data loss.