Did British Empire and Ethiopia exist in the same era?

Yes, the two civilizations both existed around 1855 CE.

Which lasted longer, British Empire or Ethiopia?

British Empire lasted longer (414 years).

British Empire: Avrupa; Ethiopia: Afrika

British Empire (1583 CE – 1997 CE) and Ethiopia (1855 CE – present) lived in the same era.

The empire with the most extensive territory in history. It was referred to as "the empire on which the sun never sets."

Federal Democratic Republic of Ethiopia · Africa

Did British Empire and Ethiopia exist in the same era?: Yes, the two civilizations both existed around 1855 CE.
Which lasted longer, British Empire or Ethiopia?: British Empire lasted longer (414 years).
Which regions did British Empire and Ethiopia rule?: British Empire: Avrupa; Ethiopia: Afrika