Samsung 348B can be used to identify 2 different, and distinct, models: the 348BRAS and the 348BEAB. The 348BRAS is the retail model which is sold w/ a 8mb buffer. the 348BEAB is the OEM, bulk package version which is sold with a 2mb buffer.
Both perform exactly the same. I myself have the 348BEAB and 348BRAS, and notice no difference besides the buffer size. Both accept the same firmware upgrades from Samsung.
If you look at the drives themselves, the only label indicator of the drive model will say "SM-348B." So maybe that's where the confusion comes from. Websites that sell the drive will list the Mfgr Part #, so you can identify the drive by looking at that.
Hope this helps!