[Q] Transfer application from system/app

Can somebody tell me if i want to use applications in system/app folder of one phone in another , how can i do this?
For example i tried to copy the memo.apk (application) from samsung galaxy s2 to xperia play's system/app folder using root explorer. After rebooting i still could not find the memo applicaiton in my mobile. I also simply tried installing the memo .apk extracted from galaxy s2 in my xperia play but it could install.

Thanks.

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