The only same thing about a block and a fix is that they're both bad as they both result in a ball in the hazards. But while the result might be the same, the causes for these two misses is actually different. A block occurs when you have an open clubface at impact, and a proper path, while a slice comes from a confluence of swing errors. To fix both a block and a slice, you must fix the clubface first and it's by weakening your grip just a touch to get more rotation of the face through the impact zone. Also, you need to fix your sequencing as your body and arms must be in sync during the downswing.

Find out more on the difference between a slice and a block by clicking here.

Source: GOLF.com; RealFeelGolfMats