SDRAM Memory with Micron chips and crucial memory - what's the difference

[screen]

Crucial memory is micron memory. I bought a 256MB PC133 SDRAM memory stick from them for $33.

I bought another 256MB PC133 from bananapc.com that had micron chips for $21 (excluding shipping). Several resellers (listed on pricewatch) are selling memory with micron chips for the same price.

The chips look different. What's the difference between these two memory sticks? Both worked in my system and both use high density memory chips (64x4 and 32x8).

I'm looking for a response in terms of the quality of memory (not the dependability of the reseller).

Thanks in advance for your response.

-Screen