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Yeah. You may still have a problem running all 4 at once as some motherboards are funny about running different pairs. But you shouldn't do any harm trying. It may beep at you and refuse to boot up with all 4 in, or reboot randomly, but you'll find out pretty soon and you can just take the 8GB out if that's the case.
Can always run a test
https://www.techpowerup.com/memtest64/
Turns out the existing ram is 1333 not 1033, so i guess that makes things better?