If I purchase a three country pass [Italy, Switzerland,Germany,] for seven days through Rail Europe, will that give me identical benefits to the Swiss Pass whilst travelling through Switzerland.
No, the benefits aren't the same for coverage or discounts. The Eurail Pass be be sufficient for you or not. You can see what is covered by the Swiss Travel Pass here, and the Eurail Select Pass here.
Often the best option is the get the 2 country Eurail Pass and the Swiss Travel Pass for Switzerland but it depends on the routes (and how many) you will be taking here.
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