For the recipe calls for 34 teaspoon of salt in 1 cup of water
The salt concentration of salt is (34/1) teaspoon per cup
= 34 teaspoon per cup
For the recipe that calls for 1 teaspoon of salt in 2 cups of water
The salt concentration of salt is (1/2) teaspoon per cup
= 0.5 teaspoon per cup
The recipe with a higher salt concentration is the first one (34 teaspoon of salt in 1 cup of water) and that will taste saltier than the other recipe.