model refers to the retail model number of the device, device refers to ro.product.device in build.prop, board refers to ro.product.board in build.prop, configuration refers to ro.product.name in build.prop. Together, device and board should uniquely identify a hardware build. Configuration refers to a particular software configuration with country-specific customizations, carrier-specific customizations, etc. A single hardware build may have multiple software configurations.
One distinction between different configurations for the same hardware build seems to be support for different locales. A list of locale support for known configurations is attached as a comma-separated values file. Remove the .txt extension to view.
Device: maguro, Board: tuna
16GB, GSM 850/900/1800/1900, UMTS 850/900/1700/1900/2100, HSPA+Configurations:
Model: GT-I9250Worldwide, not carrier-specific, Google-branded, supported by AOSPSoftware builds:I9250XXKK1, I9250XXKK2, I9250XXKK6
Model: GT-I9250Austria, Belgium, France, Germany, Hungary, Italy, Spain, UK, not carrier-specific, Samsung-branded, not supported by AOSPSoftware builds:ITL41D-I9250XWKK5, ITL41F-I9250XWKK8, ITL41F-I9250XWKK9: supports additional localesRadio builds:I9250XXKK1
Model: GT-I9250Canada, Bell Canada/Virgin, Samsung-branded, not supported by AOSPSoftware builds:ITL41D-I9250UGKK7, ITL41F-I9250UGKL1Radio builds:I9250UGKK7, I9250UGKL1
Model: GT-I9250TAustralia, Telstra, Samsung-branded, not supported by AOSPSoftware builds:ITL41F.I9250TDVKKBRadio builds:I9250TDVKKB
Model: SCH-M420SSouth Korea, SK Telecom, Samsung-branded, not supported by AOSPModel: SCH-M420KSouth Korea, KT, Samsung-branded, not supported by AOSP
Model: SC-04DJapan, NTT DoCoMo, Samsung-branded, not supported by AOSPSoftware builds:ITL41D-SC04D0MKKD: no tethering supportRadio builds:SC04DOMKKD
Device: toro, Board: tuna
32GB, CDMA2000 800/1900, CDMA2000 1xEV-DO Rev. A 800/1900, LTE 700Configurations:
Model: SCH-I515US, Verizon, Google-branded, supported by AOSPSoftware builds:IFL10B, IFL10C, ITL41D, ICL53FRadio builds (CDMA / LTE?):I515.09 V.EK01 / I515.EK02
I515.09 V.EK05 / I515.EK02