You can just read the white label to tell if they are "non-A" or "A". The Product Code would be (2x256MB - 512MB Kit - For Example) KHX3200K2/512, instead of KHX3200AK2/512.
After you purchase them, you can remove the heatspreader to be sure that you got Winbond BH-5 chips, which may or may not be re-labled Kingston. If they are relabled, (besides checking if they're Winbond - 2 Dots) only performance will give a general idea if they are BH-5 or not. The odds of getting Winbond BH-5 chips on "non-A" PC-3200 are quite high, while the odds of getting Winbond BH-5 chips on "A" revision PC-3200 is zero.