The Eaton units only work if you have the correct geometry of loader lift vs curl and cylinder ratio sizes that match the leveling valve adjustment range(if adjustable).
I am not sure the data sheets will define loader geometry requirements and cylinder ratio or not. Majority of these provide decent performance over a limited range of movement like from 20% raised to 70% raised. These can be challenging to tune in.
Some Eaton systems are level on raise only if level in both directions it might disable the float function. Again depends on system parameters
If Kubota offers hydraulic leveling option for your FEL then I suspect the Eaton unit might work