Pvt William Greenberry "Green" Bunch - Two men named Green Bunch, born abt 1839 TN

Looking to confirm husband of Sidney Armstrong

Are they the same man afterall?

and who is Sidney Bunch ---
Same as Sidney E Bunch ???

Makes zero sense:
When Mary T Bunch was born about 1854, her father, Green, was 15, and her mother, Sydney, was 19. In 1860, she was 6 years old and lived in McMinn, Tennessee, with her father, mother, and sister.
per 1860 Census: https://www.ancestry.com/sharing/9099214?mark=7b22746f6b656e223a224...
----

FS has them muddled as well...

Spouses and Children
William Greenberry Bunch
Male
1839–1863
•
KGS4-K4C
Sidney E. Armstrong
Female
1835–1909
•
2H2J-95F
Marriage
27 April 1859
Meigs, Tennessee, United States

Children (6)

Mary T. Bunch
Female
1854–Deceased
•
9WVK-RYW

William Alfred Bunch
Male
1856–1941
•
9DM7-VCF

Margaret Bunch
Female
1860–Deceased
•
MDK8-W34

Beriah R Bunch
Male
1869–1938
•
9DM7-VHS

Samuel Frazier Bunch
Male
1870–1944
•
KD7P-P1G

Tinee Belle B Bunch
Female
1875–Deceased
•
GHM8-Q5J