I just read out my location magnetic declination value in https://www.magnetic-declination.com/
and its showing -1.16 as shown in image below.
But in mission planner same location showing -0.02.is that ok or I misunderstood the thing.
https://www.google.com/search?q=1.16deg+to+rad&oq=1.16deg+to+rad&aqs=chrome..69i57.2215j0j7&sourceid=chrome&ie=UTF-8
at a guess its in radians
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Any way to change the units in degrees?
not normally, as its a set and forget value, and most people use the auto declination setting
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Sure divide radians by 57.296 and enter it 
. Or as suggested leave it on auto and forget about it.