Yes, you're right, mine too. Most of the images online I saw were very similar. They were possibly misidentified. This image clearly shows the difference with the V and the black horn.
http://images.google.com/imgres?q=manduca+quinquemaculata&hl=en&biw=1276&bih=680&gbv=2&tbm=isch&tbnid=zlT63AEd3bHpJM:&imgrefurl=http://bugguide.net/node/view/36844&docid=bvT041DbRUeOiM&imgurl=http://bugguide.net/images/raw/CKXKCK0KPKRKO06Q6KLK1KGKAKUQ1K7KRS9QJ0BQZS7KVKIKPK8QPKGQV0HKV0ZKT0EQ9KZKB00K.jpg&w=558&h=307&ei=jriYTqnnHrHC0AHIoLTlBA&zoom=1&iact=hc&vpx=556&vpy=186&dur=17&hovh=166&hovw=303&tx=133&ty=123&sig=109161674082504177619&page=1&tbnh=114&tbnw=208&start=0&ndsp=15&ved=1t:429,r:12,s:0
Yes, they both have the 7 lines. They are remarkably similar. The horn at the rear seems to set them apart. My guide states M. sexta has red horn, like this one, and M. quinquemaculata has a black horn.
That's funny, Sarah. As it turns out, tobacco hornworms are known to enjoy eating tomatoes as well as tobacco. The seven lines on the body are the distinguishing features.
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