Classic and a Classic Primus keys use different keyways, so just dropping the finger pins will not allow a Classic key to fit into the Primus cylinder.
Everest keys are interchangeable as the keyways are the same for Primus vs non Primus, so just dropping the finger pins will allow an Everest key to fit into the Everest Primus cylinder.
Everest 29 keys are interchangeable as the keyways are the same for Primus vs non Primus, so just dropping the finger pins will allow an Everest 29 key to fit into the Everest 29 Primus cylinder.
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