I've compared the character sets in each of DB envts. But, that does not seem to be the problem.
That is, the character sets are the same ?
Is there any other OS/ System properties I need to check for this issue?
Did you set NLS_LANG environment variable before exporting and before importing ?
Yes, The character sets are same.
And, I've not set any NLS_LANG variable before importing and exporting.