Yasitha, lz4HC only works this way, find a way to unpack game files manually by searching the net for tools, find what method was used to actually compress the game
lz4hc -12 -B7 or lz4hc -11 -B7
then pack the game with that same method and run a xdelta to check for differences 
enjoy
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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