Did British Empire and Russian Empire exist in the same era?

Yes, the two civilizations both existed around 1721 CE.

Which lasted longer, British Empire or Russian Empire?

British Empire lasted longer (414 years).

British Empire: Avrupa; Russian Empire: Avrupa

British Empire (1583 CE – 1997 CE) and Russian Empire (1721 CE – 1917 CE) 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."

The empire with the most extensive territory in the world. It stretched from Europe to the Pacific.

Did British Empire and Russian Empire exist in the same era?: Yes, the two civilizations both existed around 1721 CE.
Which lasted longer, British Empire or Russian Empire?: British Empire lasted longer (414 years).
Which regions did British Empire and Russian Empire rule?: British Empire: Avrupa; Russian Empire: Avrupa