This reference states:
The two words "wholistic" and "holistic" have very different meanings, but there is some confusion and they are often used in an incorrect manner. The two words have very distinct meanings though somewhat similar in definition. Wholistic refers to the whole, a whole item or whole body of a person or thing. The word defines the consideration of the entire structure or makeup, which includes the body, mind and the spirit in the case of a human being. The word holistic is connected to holism, which focuses on the total entity and the interdependence of the diverse parts of this totality. Holistic has to do with the healing systems that are considered alternative like homeopathy and Ayurveda that deal with the human body as an interconnected whole
And yet another search:
1. variant spelling of holistic.
Is there any difference?