What is the prospecting difference between these two Vehicles?

Each FK-7 has 10 sensors, while each Groundhog has 40 sensors. :)

*wink*
Aye but what does that mean in practical terms? It takes 4 times longer to scan? You have to scan different parts of the grid? I don't understand...

Link to rules.

Take a look at the equations listed there. That should answer your questions in terms of your odds of finding a deposit as well as how long it will take.

As for your question of having to scan different parts of the grid, I assume that you are talking about one terrain grid (as opposed to a whole planet). If that is the case, then it doesn't matter where in that particular terrain grid (or "city" if you would like) that you scan.

Thank you Evan.
So if you add more prospecting vehicles to your group/party does it change the odds or time?

Yes, that is correct. As the sensors in your party are cumulative, so it adds the sensors for each prospecting vehicle.

You have been most helpful.

Glad to have been of service. :)