Did British Empire and Japan exist in the same era?

Yes, the two civilizations both existed around 1868 CE.

Which lasted longer, British Empire or Japan?

British Empire lasted longer (414 years).

British Empire: Avrupa; Japan: Asya

British Empire (1583 CE – 1997 CE) and Japan (1868 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."

Japan · Asia

Did British Empire and Japan exist in the same era?: Yes, the two civilizations both existed around 1868 CE.
Which lasted longer, British Empire or Japan?: British Empire lasted longer (414 years).
Which regions did British Empire and Japan rule?: British Empire: Avrupa; Japan: Asya