Monitor Sizes

Hi,

I am setting up a gaming setup with dual dell monitors one monitor is my old Dell E248WFP and i am planning on buying a Dell Ultrasharp U2412M I was looking around dimensions and stuff but it seems they are different sizes. Are they the same size and the plastic border on the edges of the screen are different? If thats it then cool but if its not the case then do you reccomend a different monitor thats the same exact size?

Thanks,

Aedan [:)]