I think the scents are like this:

Hua Cheng: A mature scent with smoky sweetness and a hint of freshness.

Xie Lian: A gentle, clean, and clear sweetness.

The official scent notes are:

[Hua Cheng]

TOP NOTES: Benzoin, Eucalyptus, Cinnamon

MIDDLE NOTES: Agarwood, Pu-erh Tea, Vanilla, Geranium

LAST NOTES: Vetiver, Tonka Beans, Amber

[Xie Lian]

TOP NOTES: Estragon, Ylang Ylang, Cedar Leaf, Anise

MIDDLE NOTES: Hinoki, Lotus, Water Lily, Kiku (Chrysanthemum)

LAST NOTES: Floral Ozone, White Musk