NavSim with Unity 3D - Help with Chaning my own scenario

Hello, I have been trying to run a scenario by the component of ScenarioFromFile in my own scene after following steps mentioned in the documentation.
I put the apps/navsim/multirobot/scenarios/multirobot_server.json on the Filename of ScenarioFromFile.
Here is multirobot_server.json.
“scene”: “warehouse”,
“description”: “Instantiating multiple robots with only actuators”,
“robots”: [
{
“prefab”: “Carter”,
“name”: “carter_0”,
“node”: “robot_0”,
“pose”: [0, 0, 0, 1, 23, -4.1, 0]
},
{
“prefab”: “Carter”,
“name”: “carter_1”,
“node”: “robot_1”,
“pose”: [0, 0, 0, 1, 23, -2.6, 0]
},
{
“prefab”: “Carter”,
“name”: “carter_2”,
“node”: “robot_2”,
“pose”: [0, 0, 0, 1, 23, -1.1, 0]
},
{
“prefab”: “Carter”,
“name”: “carter_3”,
“node”: “robot_3”,
“pose”: [0, 0, 0, 1, 23, 0.4, 0]
},
{
“prefab”: “Carter”,
“name”: “carter_4”,
“node”: “robot_4”,
“pose”: [0, 0, 0, 1, 23, 1.9, 0]
},
{
“prefab”: “Carter”,
“name”: “carter_5”,
“node”: “robot_5”,
“pose”: [0, 0, 0, 1, 23, 3.4, 0]
}
],
“obstacles”: [
{
“prefab”: “Color Camera”,
“name”: “birdeye view”,
“pose”: [0.7071068, -0.7071068, 0, 0, 0, 0, 27]
}
]
}
I have a question. According to the documentation, robots have to be created as the Carter in my scene cause “prefab”: “Carter” in the Json. But I have 6 Carter_Base. When I change the pose in Json, the robots’pose are changed.
So I think the Json file works in my scene. however the robots are unmatched.
I’d like to use my own robots in my own scene. how to change it?
Screenshot from 2021-02-23 15-31-47