Ram model different by a letter ?

roasted

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Hello, i have a delicate motherboard memory wise, it's the MSI MS-7613 and it only takes 2rx8 sticks, 4gb max with densities of 256m per chip in the stick, so anyways my pc currently has a Samsung M378B5273CH0-CH9 4gb ddr3 1333 cl9 unbuffered.

I've been searching and the best option i've found this far was a model that has pretty much the same specs but the model is called M391B5273DH0-CH9 with the "D" instead of the "C" in mine.

I did some research and i've found this link http://www.samsung.com/semiconductor/global/file/product/ddr3_product_guide_dec_12-0.pdf

It says there that the difference between the two is one C-die Comp. Version and the other one (the one i want to buy) is D-die Comp. Version, what does this mean, they're both the same speeds, both unbuffered, both the same density and everything but the one difference is that, would they work together ?

I really don't want to go into the problem i've ran into, i've purchased 3 different ram sticks and none of them have worked with my motherboard, can someone help me and tell me if that one would work with my mobo ? thanks in advance.
 
The extra alphabetical suffix just relates to the design or revision of the memory chips used.
The memory chips themselves could of been redesigned for example to consume a lower amount of voltage per chip.

As long as you know the speed of the memory is the same, voltage,and both are of the same type Ecc enabled or buffered ect

Plus the Latency timing values the memory sticks run at eg.

9-9-9-28 as an example.

The memory size per chip populated on the ram stick you should have no problems with them running together roasted.
 

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Shaun, could you please take a look at the datasheets of each memory and tell me what you think? Probably there's some important information regarding whether they work together or not, here's the links:
http://cdn.samsung.com/semiconductor/global/file/2011/product/2009/12/28/620693m378b5273ch0_cf7_cf8_ch9_ck0.pdf
http://cdn.samsung.com/semiconductor/global/file/2011/product/2010/11/19/055478m378b5273dh0-cf8_ch9_ck0.pdf

Thanks in advance.