@gcortes
As has already been stated the HomeKit versions of the Fibaro products only work (officially) with HomeKit. Similarly the non-HomeKit Fibaro products do not work (officially) with HomeKit at all.
What is currently possible is to set up a HomeAssistant server as a HomeKit controller and have HomeAssistant control the Fibaro HomeKit product. HomeAssistant can then also run an MQTT broker to ‘share’ the device and you can also run a MQTT client on Smartthings to talk to the HomeAssistant system.
The result is that Smartthings would then be able to utilise the HomeKit only products.