chip selection

hello everyone, I have this diagram(https://arduino-vgaout.googlecode.com/files/VGAout_Schematic.pdf) of an arduino connecting to a RGB VGA port, my problem is: Can I use the Arduino Uno instead of the ATMEGA328P (or is it the same?) and the operating voltage for the ATMEGA328P is 3V while the VGA port uses 5V, could the diagram be wrong?

Yes they are the same thing. In fact the pictures show an Arduino, the one we had before the UNO. You can use a UNO but the project is a bit ropy and will not work with all VGA monitors.