SanDisk Ultra II® SSD

Excuse me… Could you double check something for me?

I just got 2x Ultra II 480gb’s…

One reports as: “Sandisk Ultra II 480Gb” with firmare X41100RL

Other reports: “Sandisk Ultra II Solid State Drive” with firmware X31200RL

Both Firmware’s are current.  So I seemingly have two different types of “Ultra  II” drives    !!!

I want to run this in Raid 0, and they do work…  and fast, too. Tested all this afternoon after raid configuration…

But dis-simelar firmware on two drives in a Raid 0 is not (normally) a good thing… Well, it’s not normal do dissimelar drive types… And I seem to have 2 different drives, both reporting to be same size…

Why do I have 2 different drives when purchased at same time, with same box, same barcodes, same names?