What is the difference between spondylolisthesis and cervical facet dislocation?

What is the difference between spondylolisthesis and cervical facet dislocation?

Spondylolisthesis is a bilateral fracture of the pars interarticularis with displacement of the vertebral body. It can occur at any level of the spine

Cervical facet dislocation is when the ZP joint, or facet joint (the articulate joint that makes up part of the spinal nerve root foramen), becomes dislocated, usually compressed the spinal nerve root +/- spinal cord depending on severity of dislocation