Comparisons can be REALLY tricky! Let's see if I can help clear up the template idea. Let's take the following constructions:
more _____ than (or just "more than")
same _____ as (or just "same as")
as many ______ as (or just " as many as")
Notice that any of these constructions can be fully stripped down:
My car is the same as my sister's car. Alternatively, the comparison might be more complex and refer to a specific aspect of the thing we're comparing:
My car is the same color as my sister's car. Things get most complicated when you're dealing with the NON-stripped down version. My trick is to read the sentence pulling all of the specifying text out from the comparison marker to see if I actually am comparing the same thing. For example:
The Amindo Bank has more customers on average than those of the Harria Bank. Do I need to include "those of" since we're talking about customers?? I test by stripping out the specifying test that was snuggled into the middle of the comparison marker ("customers on average"):
The Amindo Bank has more customers on average than those of the Harria Bank. I want to compare what one bank HAS to what another bank has. I don't want to use "those of" here - it is incorrect.
So let's look at your example:
Laos has the same land area as the land area of Country X.
Laos has the same
land area as the land area of Country X.
Laos has the same
land area as Country X.
We want to compare Laos to another country, not to a land area. Since the "land area" is rolled into the comparison marker, we don't want to repeat it!