We see the probe droid crash. Later we see something crash. It doesn't matter if it's the same shot from a different angle. the way it was used makes it clear that it isn't a probe droid but one of the meteors they talk about. It also makes sense to show a meteor crash to establish that meteors are fairly common and nothing to be too worried about.
I see how it was originally planned to have the probe crash near Luke's position. In editing however they might have thought that this chain of events would seem too coincidental. It would be hard to belive that the probe droid didn't spot the rebels' base earlier. After all, Luke is within the range of a Tauntaun when he escapes the Wampa's cave. So what we see in the movie is this:
The probe droid crashes somewhere on the planet and slowly moves towards the rebels' base. Then there is Luke, he's fairly close to the base and spots a meteor, which he wants to investigate. He is attacked by a Wampa, rescued by Han and brought back to the base. In the meantime, the probe droid has made its way to the shield generator, where it gets detected by the rebels. Then Han shoots it.
If the rebels can spot it near the shield generator, why wouldn't they spot it, if it was that close to Luke, who is within Tauntaun range? Of course they should have thought about this during filming, but the result wouldn't look much different.