Did British Empire and Democratic Republic of the Congo exist in the same era?

Yes, the two civilizations both existed around 1960 CE.

Which lasted longer, British Empire or Democratic Republic of the Congo?

British Empire lasted longer (414 years).

British Empire: Avrupa; Democratic Republic of the Congo: Afrika

British Empire (1583 CE – 1997 CE) and Democratic Republic of the Congo (1960 CE – present) lived in the same era.

	British Empire	Democratic Republic of the Congo
Period	1583 CE – 1997 CE	1960 CE – present
Duration	414 years	66 years
Region	Avrupa	Afrika
Capital	Londra	—
Type	Empire	Country
Government	Anayasal Monarşi	Cumhuriyet
Religion	Hristiyanlık (Anglikan)	—
Language	İngilizce	—
Peak population	458,000,000	86,790,567
Rulers	10	5

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

Democratic Republic of the Congo · Africa

Did British Empire and Democratic Republic of the Congo exist in the same era?: Yes, the two civilizations both existed around 1960 CE.
Which lasted longer, British Empire or Democratic Republic of the Congo?: British Empire lasted longer (414 years).
Which regions did British Empire and Democratic Republic of the Congo rule?: British Empire: Avrupa; Democratic Republic of the Congo: Afrika