Weird file sizes in Finder

in finder, have "install xcode.app" file 1.81 gb. told finder duplicate it, , created "install xcode copy.app" file 1.57 gb. why isn't duplicate same size original?

did info on original, , said size "1,814,588,172 bytes (1.81 gb on disk)". did info on duplicate, , said size "1,570,347,315 bytes (1.81 gb on disk)". why both of them "1.81 gb on disk" number of bytes different each one?

running lion 10.7.2.

 

i did little more investigating. turns out .app files directories. (i'm new macs, didn't know that.)

installed deltawalker (a program lets diff on files/folders), , says "install xcode.app" directory same "install xcode copy.app" directory. both have same files , subdirectories, , of content/data within of files same.

looks duplication worked perfectly, there's bug in finder. not reporting size of "install xcode copy.app" correctly. reason thinks different size "install xcode.app", though both same.

 

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