How similar or different is Tantric Buddhism from Vijnana Bhairava of Kashmir Shaivism? Tantra exists in certain traditions of Buddhism (I guess mostly in Tibetan and certain Theravada schools as well). It also exists in Kashmir Shaivism, as explained in the Vijnana Bhairava.

Can someone please help me understand how the schools Buddhism and Kashmir Shaivism differ (and are similar) in their approaches as well as goals for Tantric practices.
Load Buddha was enlightened by understanding  the eternal law (of patichchasamuthpada) 
OR four Noble truth, and Moksha. 
OR delusion and how to avoid it. 
OR Life is a dream and how to awake from it.

For explaining this he (and his followers) used several methods according to what the listener already believed.

Tantra-meditation and ritual practices that seeks to channel the divine energy of the macrocosm or godhead into the human microcosmThantra

Bhairav Tantra-it briefly presents 112 meditation methods or centering techniques (dharanas). Bhairav Tantra

These include several variants of 
-breath awareness,(Ānāpānasati (Pali; Sanskrit ānāpānasmṛti, meaning "mindfulness of breathing") is a form of Buddhist meditation now common to Tibetan, Zen, Tiantai and Theravada Buddhism as well as Western-based mindfulness programs.) 

-concentration on various centers in the body,(Sathipattana) 

-imagination and visualization and contemplation through each of the senses.(Five Aggregates)


Moksha - Identity with Shiva(the deity who represents Universal Consciousness) - Link Kashmir Shaivism


Dilution is I - (My Self) concept. To remove this need systematic process. Tantra images are intermediate steps of some traditions.