What I am saying is that different states run different analysis on the soil. A soil from Texas would be more likely to have a salt or sodium problem than a soil from MN, so a TX lab may routinely run tests they would not run in MN. There are also regional differences in how labs do pH analysis, lime calculations, and P/K extraction solutions. In WI, all soil labs use Bray-1 to extract P and K. No other state uses Bray-K, and Bray would be a poor choice to extract P in a high pH soil. States that tend to have high pH soils would have labs that use Olsen-P or Mehlich3-P for more worthwhile results.
Soils are different based on climate, plant life/human use, landscape position, parent material, and time. There can be significant differences in soils, even in the same 20 acre field (usually from landscape position differences). That is why precision farming, taking soil samples by GPS coordinates, and variable rate application of lime and fertilizer are becoming more common. The methods to test these soils would be similar, but the lime and fertilizer recs could be greatly different (that is why a soil test is taken).