PropertyBinding.cs

[HideInInspector] public PropertyInfo   SourceProperty;
[HideInInspector] public PropertyInfo   TargetProperty;
[HideInInspector] public string         SourcePropertyName;
[HideInInspector] public string         TargetPropertyName;

public MonoBehaviour    Source;
public MonoBehaviour    Target;

void Awake()
{
    #if !UNITY_EDITOR
    var tempTarget = from targetProp in Target.GetType().GetProperties()
                     where targetProp.Name == TargetPropertyName
                     select targetProp;

    var tempSource = from sourceProp in Source.GetType().GetProperties()
                     where sourceProp.Name == SourcePropertyName
                     select sourceProp;

    TargetProperty = tempTarget.FirstOrDefault();
    SourceProperty = tempSource.FirstOrDefault();
    #endif
}

void Start()
{
    SourceProperty.ObserveEveryValueChanged(x => x.GetValue(Source, null)).Subscribe(UpdateTargetProperty);
}