Did British Empire and United Kingdom exist in the same era?

Yes, the two civilizations both existed around 1707 CE.

Which lasted longer, British Empire or United Kingdom?

British Empire lasted longer (414 years).

British Empire: Avrupa; United Kingdom: Avrupa

British Empire (1583 CE – 1997 CE) and United Kingdom (1707 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."

United Kingdom of Great Britain and Northern Ireland · Europe

Did British Empire and United Kingdom exist in the same era?: Yes, the two civilizations both existed around 1707 CE.
Which lasted longer, British Empire or United Kingdom?: British Empire lasted longer (414 years).
Which regions did British Empire and United Kingdom rule?: British Empire: Avrupa; United Kingdom: Avrupa