phony package to override packages

Android.mk

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

MY_OVERRIDE_PACKAGES := \
  watchhome
LOCAL_MODULE := override_packages
LOCAL_MODULE_TAGS := optional
PACKAGES.$(LOCAL_MODULE).OVERRIDES := $(strip $(MY_OVERRIDE_PACKAGES))
include $(BUILD_PHONY_PACKAGE)

Hi.
Why MY_OVERRIDE_PACKAGES? Is there any difference between

MY_OVERRIDE_PACKAGES :=
watchhome
LOCAL_OVERRIDES_PACKAGES := $(strip $(MY_OVERRIDE_PACKAGES))

and

LOCAL_OVERRIDES_PACKAGES :=
watchhome

?

@KonstantinRitt, No difference. MY_OVERRIDE_PACKAGES is defined for more readable.

Thanks for reply.
Anyways, this didn't work for me on kk.
After some investigations, I found a non-intrusive solution by adding

PACKAGES.$(LOCAL_MODULE).OVERRIDES := $(strip $(LOCAL_OVERRIDES_PACKAGES))

just before

include $(BUILD_PHONY_PACKAGE)

@KonstantinRitt I made a mistake. LOCAL_OVERRIDES_PACKAGES is not used by BUILD_PHONY_PACKAGE. I firstly post this in stackoverflow.

Where would I place the Android.mk file?