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Generally, mixing brands is okay. (assuming both are compatible with your motherboard)
If you're overclocking and tuning memory access to the limit then yes, it's better to have a matched pair, but in most other cases it won't make a difference.
If your motherboard can use dual-channel access then it will need the same size DIMMs to activate that feature. The brand won't be important.
Even if you buy the same brand there's no guarantee the DRAM itself will be the same. Different batches can use different components, and this is almost guaranteed if you buy them at different times.
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