Can I use the same recommendation letters for more than one application?

No you can not.  Letters of recommendation are specific to each application.  If you have applied more than once you will need to have separate recommendation letters for each application.

We will not move or copy recommendation letters from one application to another.  Recommenders are asked to give a recommendation based on the specific program you are applying to, so when you apply to a second/different program new letters of recommendation are required.