pc133 crucial memory question: -7E B vs. -7E E

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so i have 2 sticks of 256mb PC133 Crucial memory.

both are 133mhz , cl2 based on the sticker. both are the same part: ct32m64s4d7e.16t

but as i say, one is -7EB on the chips and the other stick has -7EE


the EB stick is taller in height, the EE stick shorter.

But any difference in their respective performance???