The only difference is what the person see in it. I don't see one, though I was just explaining how most Pagans and other who use Statues within Worship see it ^_^
The Images and/or objects are not worshiped. They may be use by the believer in worship has something to focus on, but it is nothing more than that really. The Object isn't a god/goddess...but a representation of said deity..
Did those pictures come from Rome and/or Greek Artist? Cultures take art style and stuff from each other all the time and the Romes and Greeks had a lot of contact with the Egyptians so it's not surprising that there are similarities in the art and depictions. Doesn't mean Christians took it(and...