Dell T410 adding a new processor

Hi everyone,

My knowledge is not enough maybe this is a simple question for you. I have a Dell T410 with following processor installed:

Processor,E5506,2.13/4.8,4MB Intel Dual Socket Nehalem

1. I want to add a new processor but I don't know if they should be exact the same processors to work together or they can be different.

2. If the answer above is yes can I add any of following:

Intel Xeon E5462 SLANT 2.8GHz 12MB 1600MHz Quad-Core Processor
Intel Xeon E5620 Processor CPU SLBV4 2.4 Ghz 12M FCLGA1366

Thanks