You could try but even if you can get it to load it wouldn't pass validation properly and you'll need to correct all of the errors. In a situation like this I would take the chance to go through the config and just rebuild it, migrating over objects so you don't have to go through and rebuild them.
Thank you so much for the help and support from all of of you. This old 4020 has only Firewall, NAT and OSPF routing config and has been successfully loaded to PA3250 without any error. I have validated the policy, objects, NAT etc and everything just match with existing PA4020.
Kindly let me know if there is anything I need to check before I plan this migration. Also, I have my new PA3250 on PANOS 8.1.3h as per TAC recommended version.
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