They differ in the amount of mixture. Jager Bomb consists of 1/2 can Red Bull & 1-2 oz of Jagermeister liquor. Bull blast consists of 1 oz Jagermeister & 8 oz Red Bull.
Jager Bomb recipe:
1/2 can Red Bull® energy drink
1 - 2 oz Jagermeister® herbal liqueur
Pour red bull into a medium sized glass. Add a shot glass of jagermeister, and chug.
Bull Blaster recipe:
1 oz Jagermeister® herbal liqueur
8 ozcan Red Bull® energy drink
Pour a small can of red bull into a highball glass. Add jagermeister, and serve.