In any Container Orchestration engine (kubernetes or openshift), there are steps to be carried out, starting from designing the pipeline to pull the source code, create the Docker images, define the configuration to deploy the application and expose it.
Then, why is the term "choreography" is used in Openshift(reference) and term "Container Orchestration" is used in Kubernetes. What difference does it make?
OpenShift as a Kubernetes fork and vendor is free to invent whatever new terminology they want for marketing purposes. None of these terms have formal definitions in the first place, but even without that marketing is its own domain and rarely bound by such things. My guess is their marketing team thinks "choreography" conjures a feeling of overall poise and balance? Which the think aligns with their brand in some way.
tl;dr it's advertising, not technical terms.