The structure here is: "to sacrifice X for Y", e.g. "to sacrifice comfort for fashion".
In your sentence #1, you must make sure you feel passionate about Y (i.e. the object of the sacrifice).
In sentence #2, however, you must make sure you feel passionate about X (i.e. the thing which you sacrifice).
In most contexts, I would think, you would want to use the #1 form: e.g. you might feel passionate about fashion, and would therefore be willing to sacrifice comfort to it.
Post again if it's still unclear!
Student or Learner