This can be a tough one because the sentence is utilizing a metaphor. Here, Jewel is saying that the second album has a spirit. A look at Google gives as one of the possible definitions for spirit:
those qualities regarded as forming the definitive or typical elements
in the character of a person, nation, or group or in the thought and
attitudes of a particular period
Focusing on the highlighted portion of the definition, we can interpret Jewel's comment saying that the two albums share the same qualities that define the character of the albums. In other words, she believes that the two albums share some, perhaps otherwise indescribable, core characteristics.