Move Y2 and Z2 pins defines to pins.h

Marlin/pins.h

   #define Z_MIN_PIN          -1
 #endif
 
+#ifndef Y2_STEP_PIN
+  #define Y2_STEP_PIN      E1_STEP_PIN
+  #define Y2_DIR_PIN       E1_DIR_PIN
+  #define Y2_ENABLE_PIN    E1_ENABLE_PIN
+#endif
+
+#ifndef Z2_STEP_PIN
+  #define Z2_STEP_PIN      E1_STEP_PIN
+  #define Z2_DIR_PIN       E1_DIR_PIN
+  #define Z2_ENABLE_PIN    E1_ENABLE_PIN
+#endif
+
 #define SENSITIVE_PINS { 0, 1, \
                         X_STEP_PIN, X_DIR_PIN, X_ENABLE_PIN, X_MIN_PIN, X_MAX_PIN, \
                         Y_STEP_PIN, Y_DIR_PIN, Y_ENABLE_PIN, Y_MIN_PIN, Y_MAX_PIN, \

Marlin/pins_LEAPFROG.h

 #define E1_DIR_PIN          40 //40
 #define E1_ENABLE_PIN       36 //36
 
-#define Y2_STEP_PIN         37
-#define Y2_DIR_PIN          40
-#define Y2_ENABLE_PIN       36
-
-#define Z2_STEP_PIN         37
-#define Z2_DIR_PIN          40
-#define Z2_ENABLE_PIN       36
-
 #define SDPOWER            -1
 #define SDSS               11
 #define SD_DETECT_PIN      -1 // 10 optional also used as mode pin

Marlin/pins_RAMPS_13.h

 #define Z_MAX_PIN          19
 #define Z_MIN_PROBE_PIN    -1
 
-#define Y2_STEP_PIN        36
-#define Y2_DIR_PIN         34
-#define Y2_ENABLE_PIN      30
-
-#undef Z2_STEP_PIN
-#undef Z2_DIR_PIN
-#undef Z2_ENABLE_PIN
-
-#define Z2_STEP_PIN        36
-#define Z2_DIR_PIN         34
-#define Z2_ENABLE_PIN      30
-
 #define E0_STEP_PIN        26
 #define E0_DIR_PIN         28
 #define E0_ENABLE_PIN      24