Well, officially the constellations are defined as particular areas of the sky. The join-the-dots constellation figures (which are more useful for actually identifying the stars involved) are not set in stone.
Sometimes the figures don't even stick to stars from the official constellation - many star charts join up the square of Pegasus even though Alperatz is in Andromeda for instance.
btw my 2c about finding stuff - I've found that the act of looking for something in particular, whatever it is, star, galaxy, globular cluster whatever, makes you look *in depth* at the region of sky that contains it, and you see much more in the process. There's a real, satisfying difference between looking and seeing!
