For example, can you import the json file from 0.9.3c into the graphene cli?
I don't know about that particular questions .. but I'll research
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You most certainly can import the 0.9.3 json into the cli_wallet. Use
Import_accounts <path to exported json> <password of wallet you exported from>
The issue is that this doesn't automatically claim the balances these keys hold. They have to be imported one by one (unless this has been updated recently) I think the proper syntax is
Import_balance <account name> <private key> true
But I always import my accounts and then use the gui to import my balances cause it's way easier.