I always confuse the two.
I was actually meeting friends one time and they told me to meet them at the "Backlot Express". so, my 7-year old and I traipsed across the park (from Star Tours nonetheless) to what I thought was the right place – only to find out it was the "Studio Catering Co." across form The Backlot Tour and "Backlot Express" was actually next to Star Tours, where we had just been. Ugh!
The name makes no sense. Even when the park first opened, it still wasn't anywhere close to the Backlot.