Aparmita is the name given to Amitabha in his character of bestower of longevity. Aparmita may be turned either a “Crowned Buddha or a Bodhisattva and is therefore richly clad and wears the thirteen ornaments.
Chenrezig is an enlightened being who is a manifestation of all Buddhas' compassion. Chenrezig is known the 'Buddha of Compassion'. Chenrezig usually appears as white in color with four arms.