Most modern machines use the flat face style couplers. If you have two machines with different couplers, you will either need to make up an adaptor, or buy new couplers for one machine and all its attachments so you have only one type.
With an adaptor you will extend the couplers out quite a bit. For some attachments that's fine, but others its really not, they can get in the way and snag on things and break off.