Universal Love and Metta in Buddhism are the same, yet from a personal perspective, there are different orientations.
First of all, Consciousness is universal, it is never personal.
The manifestation is the consciousness expressed itself in the form of thought, the energy intertwining with the veiling of sentience i.e. Shiva-Shakti, and or Samsara.
The consciousness is the pure witness in stillness and silence whilst observing the show on manifestation.
It is the misidentified individual with the body sentience that experiences the manifestation.
The person is the shadow of the conscious substance, and it does not matter how hard the individual tried, the shadow can never become the substance.
From the personal perspective, Metta is the personal rationalization of what should or should not be, with a sense of doership, whereas from the consciousness perspective, Metta is the nature of the conscious presence free of the shadow of the mind.
Devoid of the mind, in a state of no-self, Universal Love and Metta is the one aura of the conscious presence, intrinsically one, yet conceptually apart.