ram mixing

Hi i wanna know if i can mix two different ram pair in one mobo .

my spec is :

cpu - ryzen 5 3600

mobo - msi b450 tomahawk

gpu - asus gtx 1660s

psu - thermaltake smart se 730w 80 plus bronze

about ram i have adata xpg spectrix d41 ddr4 rgb 2666mhz 8gb x2 overclocked to 3000mhz .

i know i should go for 3200mhz but for the moment i cant buy another set of 32gb .

so i found ADATA DDR4 2666 PC4-21300 8gb x2 with cheap price and i wonder if i can mix them with mine and overclock them to 3000 or 3200.

the reason why im goin upgrade my ram is rust moded server keeps eating memory .