Why would two copies of Lightroom 5 create DNG files with different sizes from the same RAW file? (size is dramatically different, on the order of doubled in size.)

I have a copy of LIghtroom 5 on my office computer and a personal copy on my home computer. I convert my RAW files to DNG with Lightroom when I import them. Files I shoot for work also get imported on my home workstation. I noticed today that the resulting DNG files for the same RAW image are widely different in size. The ones at home are roughly twice as big as the ones from the office.
To the best of my knowledge, things are set up the same on both workstations. Any idea what setting might be causing this variation?

I don't think it's possible to apply lossy compression when importing directly into Lightroom. I know you can do it with the DNG converter and on export but I don't think this is the case here.
In which case we need to determine which set-up producing is the "correctly" sized files. What's the camera and what are the respective file sizes from work and home?

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--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
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