msi b150m mortar arctic

so when i built my pc i had 2 DDR4 Ram sticks ,4Gb each (Avexir Budget series running at 2133Mhz on my system on dual channel) ,and i wanted to add another 4Gb stick (cant afford 2 more for now) ,and in my country i didnt find more sticks with the same specs ,so can i add another stick from...