Inspiron 1420 Screen Replacement

I got a Inspiron 1420 pp26l that needs a new screen. it has a WXGA Screen and according to the service tag it came with a C257H screen but the dell part store says I need a model DM110 screen. My question is how important is it that I get the same model screen or does it really matter as long as you get the right size and resolution and it says it works with the 1420?