Constellation lines drawn differently

ncc1701d

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I have noticed diagrams and images online showing constellations for a particular constellation are drawn sometimes differently. Is there universal rules about how constellation lines connect to the stars?
Like for example
http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Vela_IAU.svg/1000px-Vela_IAU.svg.png

compared to

http://www.google.com/imgres?imgurl...lhwhU-2FNIfzoASBl4GYDg&sqi=2&ved=0CI0BEPwdMAo

The lines are drawn differently for the same Vela constellation.
Orbiter does constellation lines like the second sample I show but first stample seems legit to so which might be right?
thanks
 
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