Here are my rules of thumb for deciding to reuse an HTML template to produce a second screen instead of creating a unique template.

* How difficult will it be to keep two seperate templates syncronized in look and feel? Might it be better to have the added complexity of one template with an if statement or two to gain the benefit of shared HTML code?

* Can I save the users a click by getting them to this page/data they probably want more quickly by folding two screens into one? For example, can a simple "confirmation screen" also be the next step in the users interaction with the site.

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One other thing to keep in mind; you can reuse HTML code by making good use of includes for headers/footers/navigation. This is a BIG win when it comes time to make updates to the look and feel.

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Nothing is too wonderful to be true
-- Michael Faraday