I've recently bought an MSI GF63 Thin laptop. Two RAM slots are available, but only one slot is used while the other slot is empty. The factory installed RAM chip has the following label: "SK hynix 8GB 1Rx8 PC4-2666V-SA2-11." The one that I can easily find sold online is labeled as follows: "SK hynix 8GB 1Rx8 PC4-2666V-SA1-11." Note that "SA1" vs. "SA2" is the only thing that distinguishes both RAM chips from each other. Is such a difference significant or irrelevant? I want to put another 8GB RAM chip on the empty slot to upgrade my laptop's memory from 8GB to 16GB.