Precision 7540 memory upgrade question

I want to upgrade my 7540 to 4 16GB sticks (64GB).  

A friend offered two new sticks both DDR4-2666 SODIMM with slightly different ?product? numbers (CT16G4SFD8266 and CT16G4SFRA266).  I checked the internet for the difference and found:

WHAT IS THE DIFFERENCE BETWEEN  CT16G4SFD8266 and CT16G4SFRA266?  According to the agent, the CT16G4SFD8266 part comes with dual ranked RAM whereas CT16G4SFRA266 comes with both single and dual rank RAM. In terms of performance (speed), the agent said CT16G4SFRA266 is the one to go for. Dual channel increases bandwidth, while dual rank lowers latency.Jan 8, 2022

I want to order two more Crucial 16GB DDR4-2666 SODIMM sticks (CT16G4SFRA266) for a total of 64GB.

My question is:  Will these memory sticks all work together our should I bite the bullet and order 4 identical sticks? (or 2 x 32GB)