WHAT DIFFERENT BETWEEN MBOX-IBOX

As you can clearly see from your link:

AMD Phenom II X4 9xx/9xxe/8xx Quad-Core AMD Phenom II X3 7xx/7xxe Triple-Core AMD Phenom II X2 5xx AMD Athlon X4 6xx/6xxe AMD Athlon X3 4xx/4xxe AMD Athlon X2 2xx/2xxe

Max TDP = 95 Watt


Either will work, provided they have a TDP of 95W or less. Both meet these requirements and will work in your computer.
The HDX945WFGMBOX is better than the other one though because it's stepping is C3, so it is the newest version of the Phenom II x4 945. C3, I believe tends to run a slight amount cooler and overclock better. It will use slightly less voltage. There will be no performance increase at stock though from one to the other.
 
Reason I ask, because I want to make sure it work with that mobo. Last time I bought 955 model-125W. And it was not work with my mobo, cause mobo only support up to 95W.

I see you mention stepping C3, what is that about?

Thank you for your reply