YES, it does sound like he is the same Thomas Zane!
Only I am related to another branch... through William Hilliam Zane 1785-1843 he was he son of William Zane (1750-1824) whose father was Robert Zane III (1718-1767)
My mother is Carrie Zane Mason Hughes, only child and daughter of Carrie Dorwood Zane, who was the daughter of James Hillman Zane III. He was the son of James Hillman Zane whose father was William Hillman Zane.
I will e-mail you through my personal e-mail more information and I would love any information/photos that you may have of the Zane family too. Thank YOU- Jill