I just went to JoAnn's online, did a search on basting spray, and 505 did not come up. However, when I did a search on 505, it came up! Apparently "basting spray" is not in the 505 title.
The large can from sewforless.com is 16.9 oz and red in color; the large can from JoAnn's is 11.7 oz and yellow in color. My understanding is that the red version is made in France, and that is the only difference (other than price).
I have never seen 505 sold in JoAnn stores where I am, so I'm surprised to see it sold at JoAnn's online.