Query execution time is higher with encoded plan

Sending the encoded plan along with name on prepared query has a higher execution time than just sending the name. The expected behavior is it should be the same with or without the plan.

with plan and name
"metrics":

{ "elapsedTime": "47.230833ms", "executionTime": "47.165279ms", "resultCount": 50, "resultSize": 2050 }

with name
"metrics":

{ "elapsedTime": "30.957762ms", "executionTime": "30.879123ms", "resultCount": 50, "resultSize": 2050 }

Attached the full trace