How I can copy a collection from a Mongo Cluster to another Mongo Cluster?
As per MongoDB documentation here through the db.cloneCollection(from, collection, query) it's Copies data directly between MongoDB instances.

use users
db.cloneCollection('mongodb.example.net:27017', 'profiles',
                    { 'active' : true } )


This operation copies the profiles collection from the users database on the server at mongodb.example.net into the users database on the local server. The operation only copies documents that satisfy the query { 'active' : true }.

For further your ref here , here , here and here