@TK1 Thanks for contacting us. The two parts are basically the same. When you order online by system information, you are shown what we refer to as an “external” part number, in your case number CT5300265. It is a system specific number and is mapped exclusively to the Samsung Q430 . The longer part number, CT51264BF160B , is the one that would you see printed on your module, and that is the actual module part number, or the "base" part number. You shouldn't have any problems upgrading your system with the memory you purchased. Please let us know if you have any other questions or concerns.
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