I'm trying to figure out how these are different from the binary pulsar PSR B1913+16 (other than they're white dwarfs and the binary pulsar is two neutron stars

I'm trying to figure out how these are different from the binary pulsar PSR B1913+16 (other than they're white dwarfs and the binary pulsar is two neutron stars). PSR B1913+16 is two neutron stars orbiting each other in a tight spiral, and their orbital decay corresponds with what Einstein's general relativity predicts. In fact, the discoverers of PSR B1913+16 (Hulse and Taylor) received the Nobel Prize in Physics in 1993 for showing that this was the case.