[Fyron]

For resource facilities, position only matters if there is a tie. If all of the facilities produce different amounts of resources, the one that produces the most of the relevant resource will always be used, regardless of position. The Last facility in the file will be used in the case of a tie.

Tech req levels are completely irrelevant though (as long as you are only looking at facilities that are available to build). With two identical facilities, the Last in the file is always used, even when the first has 10 tech levels of requirements and the second has 1.