Question about memory

I have 2 non working Dells I am going to use to make one working Dell.
The memory sick in them are:
DUAL IN-LINE MEMORY MODULE, 256, 333M, 32X64, 8K, 184
DUAL IN-LINE MEMORY MODULE, 256, 266M, 32X64, 8K, 184

Can I mix and match so to speak?
The second set of numbers is the only thing different.
Thanks for any help.

 

DUAL IN-LINE MEMORY MODULE, 256, 333M, 32X64, 8K, 184
DUAL IN-LINE MEMORY MODULE, 256, 266M, 32X64, 8K, 184

You can use them both but they will run at the slightly slower speed of 266 MHz vs 333MHz

 

Thank you. Thats all I needed to know