Both EPROMs look suspicious:
The ST datasheet from 2000 says "NOT FOR NEW DESIGN". Therefore I doubt they were still in production in 2008, but maybe I am wrong, because you can find many pictures showing datecodes 07/08.
Either they are all fake (most likely), or somebody started production again. You can even find 27C32A with datecode 08 and 21V Vpp:
http://www.digchip.hk/stock-M27C32A-20F1.htmlI looked through my pile of old EPROMs and found similar looking ones: They have datecodes from the late 80s. The smaller die is maybe a 12V Vpp version (but there wasn't a 12V version for 2732, at least I couldn't find any datasheets from ST). Maybe your one with a smaller die is from the mid 90s.
So I would say both EPROMs are genuine SGS/ST (probabaly used ones), but have been relabeled to a more recent datecode.
Both EPROMs look similar, although the smaller one is a 2764 instead of 2732, therefore the die is a bit larger, but it also has the groove around the edge of the ceramic case.
By the way, does anybody know why there is a dot next to the die? I also have EPROMs made by Intel, AMD and TI having a similar device next to the actual die. It looks like a diode conected between substrate and Vss pin.