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punit tyagipunit tyagi 

how code,class,object etc migration from developer org to developer org in salesforce

pease do this answer in proper format
SwethaSwetha (Salesforce Developers) 
HI Punit,
If the migration Of metadata(customization - custom objects, fields, code, pages, etc) has to between two developer orgs you can to use ANT/ Eclipse Force.com ide/Workbench as changesets can be used only to move metadata only between the production org and its sandboxes.

Steps: https://developer.salesforce.com/docs/atlas.en-us.api_meta.meta/api_meta/file_based.htm

For data migration,you can use dataloader
See https://help.salesforce.com/articleView?id=000322219&type=1&mode=1 that elaborates on how to Migrate data from one organization to another

I recommend reviewing 
https://salesforce.stackexchange.com/questions/270276/migrating-data-and-metadata-to-a-developer-org 

Happy to answer any follow up queries. If this helps,please mark answer as best so that others facing the same issue will find this information useful. Thank you