If the soil 100 miles apart is at about the same elevation and landscape position, gets the same amount of rain, has/had the same type of vegetation, and was from the same/similar parent material (glacier/rock/volcanic ash), it would be basically the same soil. That said, it still could have a different lime and fertilizer rec. Otherwise, soils 100 ft apart can be greatly different (wet swamp vs well drained uplands soil).

Here is a link to the USDA soil survey. It can be interesting to see the different soil names you may have on your preoperty, and some of their characteristics. http://websoilsurvey.nrcs.usda.gov/app/HomePage.htm