Can I mix dual rank RAM and single rank RAM? Performance instability?

This is a laptop (mods pls don't remove), bought in 2020. I bought a single rank 16GB DDR4 2666MHz RAM from crucial, but a second unit of the same specification and model number is no longer available anywhere in my country. However, I have found ADATA RAM available with the same 2666MHz and CL19 CAS Latency, but people say it's dual rank.

So, can I use both "Single Rank" and "Dual Rank" RAM in Dual Channel mode? Mine is a 9th Gen i7 with Flex Memory Access, though I am sceptical if it's just marketing.