Is there a contradiction between Mantak Chia's description of the center of life energy and Zen's description?

According to Osho, there’s no real contradiction: both Mantak Chia’s ‘behind the navel’ and Zen’s ‘below the navel’ are provisional pointers to an individually located life-center near the navel. Inches are averages, not absolutes. Use two inches below as a practical hypothesis, but verify through silence, deep breathing, and witnessing; experience—not argument or measurement—reveals your exact center.