Question : To Ghost a Hard disk.

If I were to Ghost the image of a hard disk on one particular server, can that Ghost image be used on another server? Are there any pre-requisites or similarities that should be on both servers?
Both servers will be running Windows 2003 Server Standard Edition, but I don't think the hardware specs are the same. RAM may be different. Both are HP servers.

Are there any free Ghost softwares out there? Reasonably good ones?

Answer : To Ghost a Hard disk.

Acronis says that it can restore to dis-similar hardware - see this Acronis article http://kb.acronis.com/content/1566