I'm confused about this RAMPS 1.3 vs 1.4 change also. I will ask the author about it. The only thing it applies to at all is this:
#ifdef IS_RAMPS_14 #define SERVO0_PIN 11 #else #define SERVO0_PIN 7 // RAMPS_13 // Will conflict with BTN_EN2 on LCD_I2C_VIKI #endif