Look at the AC INPUT specification. If the voltage is specified as 200-240V like the first image below then you need to get a new power supply unit. If the AC Input voltage specified shows 100-240 VAC like in the second image below then it has AC input voltage auto sensing and will automatically adjust itself to handle the appropriate AC input voltage.
Thanks ko888, I know that much. I'm wondering if the DC output #'s have to match too?
No they don't. As long as the DC Output current on the +3.3V and +5V rails is adequate you will be fine. If the DC output current has a larger value it just means it has a higher rated output capacity.
But mine says +3.3V@24A... like does the difference between 20A and 24A make a difference?
As ko888 has already replied then those amp outputs are not critical unless your system is old. Modern system use most of their power from the +12volts. That PSU will pretty much run any std system that has been put out this century.