Same specs don't guarantee compatibility.

Probably not worth the headache. RAM kits are tested together for a reason. Even if the speed, timings, and voltage match on paper, the actual memory chips inside could be different. Mixing two kits (especially different brands) often leads to instability—random crashes, boot loops, or the system refusing to run at rated speeds. You might get it to work by running everything at a slower speed or looser timings, but then you’re leaving performance on the table. For a desktop that you rely on, it’s better to buy a matching kit (e.g., replace your 16GB with a new 32GB kit) or sell the old kit and buy one matched set. The money saved isn’t worth the troubleshooting.

Future you will thank you for buying RAM that was born to work together.