Dell PowerEdge T20: motherboard

Hi!

1. Specifications:

Dell PowerEdge T20

Intel® Pentium® G3220 processor, 4GB memory and 1yr Basic Hardware Warranty Dell Price $299

and

Dell PowerEdge T20

Intel® Xeon® E3-1225, 4GB memory, 1TB hard drive and 1yr Basic Hardware Warranty Dell Price $499

use same motherboard?

2. Can I install 3.5 Optical Disk Driver in Dell PowerEdge T20 cases? 

Thank You.