Mismatch in sizes of generated files and the original ones

I fine tuned the existing model with 0.3.0 and the size of both output_graph.pb and output_graph.pbmm is 180 MB, however the size of output_graph.pbmm provided with the 0.3.0 release is 188.9 MB. Also, I generated the lm.binary and trie myself by following the instructions and getting the librispeech text corpus from the link provided in Readme, http://www.openslr.org/resources/11/librispeech-lm-norm.txt.gz, and then adding some words and sentences of my own. Again there is a mismatch of sizes-
Generated by me- lm.binary- 768 MB, trie- 13.4 MB
Github- lm.binary- 1.8 GB, trie- 276.2 MB
Am I missing something here?