The difference is in the technology used to print the two. We usually refer to the regular photo prints as lab prints since they are produced by modern digital photo printers. The prints on canvas and art papers are produced with high end inkjet printers. For a more detailed explanation, please visit the following blog post:
Giclee Printing at FinerWorks
One of the largest ranges of paper selections, while using the highest level of archival print technology allowing superior detail and color, you can create custom giclee prints of your artwork and photos.