Optionset name is already exist error occur while import solution in CRM

Error Description:
Optionset name is already exist error occur while import solution in CRM

Cause:
The schema name of the source and target environment must be same.

Target system Schema Name	Destination system Schema Name
new_TestData	new_testdata

Even though difference in the capitalisation, it won't import schema name must be same(name should be same in the  both environment)

Solutions:
 There are two solution.

• Delete the column name in the destination and import the solution.

          Cons:
             If you delete the column in the destination, the data would loss.

• Update the attribute table in the destination in the SQL as 

          "update Attribute set PhysicalName='new_TestData' where name ='new_testdata'"
          Cons:
            It works only in on-premise