Did British Empire and South Africa exist in the same era?

Yes, the two civilizations both existed around 1910 CE.

Which lasted longer, British Empire or South Africa?

British Empire lasted longer (414 years).

British Empire: Avrupa; South Africa: Afrika

British Empire (1583 CE – 1997 CE) and South Africa (1910 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."

Republic of South Africa · Africa

Did British Empire and South Africa exist in the same era?: Yes, the two civilizations both existed around 1910 CE.
Which lasted longer, British Empire or South Africa?: British Empire lasted longer (414 years).
Which regions did British Empire and South Africa rule?: British Empire: Avrupa; South Africa: Afrika