I think passion is probably the wrong word.
There is difference between what is considered "passion" and "technique" yes, but when I think of technique on it's own I think of a very mechanical set of rules that defines how to play the piano. you know how everybody says posture, "relaxed", breathing, uncurled fingers, tucking the thumb under. Anybody can achieve this.
I think by passion what we really mean is identifying the way you play with your pieces. The extension of who you are and how you feel being communicated to your audience through the piece you are playing. If you convey that well the audience will feel what you feel. For some that is easier then others, I read a statement regarding the pianist Hofmann from one of his students quoting the following
"Hofmann was possibly the greater musical mind. But, I think, Horowitz was the greater pianist, the greater virtuoso—he somehow appealed to the whole world. Hofmann could not communicate on that level"
So I think Passion is really performing your unique version of the piece being the extension of how you feel and communicating that to the audience.
Technique is the mechanical aspect of it. Hope that helps.