Replacing RAM: PC100 vs PC133

[John P. Roberts]

I have a PB G4 400 MHz ("Titanium Mercury") and want to upgrade my RAM. 
I currently have one 256 and one 128 Mb SIMM for a total of 384 Mb. 
Both SIMMs are "PC100", whatever that means. I was thinking of 
replacing the 128 Mb with a 512, to yield 768 Mb. I have two questions:

Can I just swap the 512 into the 128's ("bottom") slot, or does the 512 
need to go in the top slot and the old 256 into the bottom?

Can I have one PC133 SIMM and one PC100, or do they both need to be the 
same?

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