Change radiator temperature when another radiator is changed

Hey guys,
maybe someone can help me with an radiator automation. We have an big living room with 3 heating elements. All of them has an eurotronics zigbee radiator. Ive already used the climate-group addin from hacs to control all radiators together from HA. But sometimes we just want to quickly change the temperature on a radiator itself. In this case the other radiators wont be changed.

I was thought if its possible to do that with an automation and need a little bit help. The trigger was easy, but how can I get a value from a entity and set it to another entity during an action from an automation?

My stupid first try was this

id: '1641731539731'
alias: Test
description: ''
trigger:
  - platform: state
    entity_id: climate.eurotronic_thermo_01_thermostat
    attribute: temperature
  - platform: state
    entity_id: climate.eurotronic_thermo_02_thermostat
    attribute: temperature
  - platform: state
    entity_id: climate.eurotronic_thermo_03_thermostat
    attribute: temperature
condition: []
action:
  - service: notify.mobile_app_plex_iphone_12
    data:
      title: Temperaturstatus
      message: |
        Test: {{state_attr('climate.eurotronic_thermo_02_thermostat',
        'temperature')}}°
  - service: climate.set_temperature
    target:
      entity_id: climate.eurotronic_thermo_01_thermostat
    data:
      temperature: climate.eurotronic_thermo_02_thermostat.temperature
mode: single

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