What makes you inspired and excited to do something? Does that relate to work?
Motives and values are different. Values are conscious, motives unconscious. Values are adaptive, motives deep-seated. This makes it easier to change one than the other.
People are often motivated by what interests them, although this does not necessarily mean that they have any particular aptitude (as viewers of the X-Factor can attest). Some are motivated by money (not always selfishly) and the same point applies.
Conversely, the fact that someone has ability in a particular area does not always mean that they are motivated to do it.
This is one of the reasons that ALL the factors of Authentic Vocation are relevant, although for those happy with their career path they do no have to be considered in depth.