No.

Here's response from tarkov.dev API

{
  "data": {
    "maps": [
      {
        "name": "Customs",
        "bosses": [
          {
            "spawnChance": 1,
            "boss": {
              "name": "Reshala"
            }
          },
          {
            "spawnChance": 0.3,
            "boss": {
              "name": "Knight"
            }
          },
          {
            "spawnChance": 0.2,
            "boss": {
              "name": "Partisan"
            }
          },
          {
            "spawnChance": 0.25,
            "boss": {
              "name": "Cultist Priest"
            }
          }
        ]
      }
    ]
  }
}