Difference between pasting and inserting an image?

[puff]

This might be a dumb question, but is there any difference between pasting and inserting an image into the word document? I'm not talking about pasting from another application. If I have a folder containing an image, I can either copy and paste it from the folder or I can insert it from the menu. From my side, the image looks the same in the doc, but is that also the same from the Word side? If there's a difference, which one is more reliable? [One of my doc once lost all the images and some people said it was because I pasted them]. Additionally, if there's a difference, will they be expressed by different codes in VBA? Thank you very much!