No, the only OE identifier used, which was internal to the assembly facility (American Axle & Manufacturing--AAM) was a color code on the shaft(s). I don't know that anyone here has ever done research to document the colors used in each application. No idea what process, if any, is used in the aftermarket--Moser, Yukon, Dorman, etc.
The axle HOUSING does have an identifier--stamped code numbers on the right axle tube, forward side, between the spring pad and point where the tube is secured in the center casting.
There are only 2 housings used (for 3-channel ABS) on 91-96 Buick & Chevy sedans, and 2 corresponding axle shaft lengths--even though there were several additional PN's used by GM for the same housings--disc brake cars had their own axle shaft PN's, even though it was not possible to note a physical difference sitting side-by-side with a drum brake axle shaft.
Before last year's crash, there was a thread in which I had posted the housing codes--a number of years ago. Took me a while to find this one: axle code stamping--photos available - from 4/20/2003. Of course, it's a "dead" thread, and the data is lost, but I do still have pix I can send via e-mail or possibly re-post.
Searching past August 2009 is a trip down memory lane--LOTS of questions we'll never see again, and many names from the past--some are still around, some are not.
I did run across some information in an unpublished tech article I was working on for the Impala SScene magazine--I don't recall when I started it, but the last time it was updated was Dec 2007: