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Yes you can mix and match 50 ohm coax.  Dont over concern yourself with the length.  As long as the run isn't too long, like 200ft, LMR400 should be fine to 100-150ft, anymore than that and I would step it up to LDF4-50A or larger depending on the length of the run.  For short runs again, use whatever reaches from point A to point B should work fine unless you have other issues.