Can I use MainNet data( Merkle, Genesis, epoch, nounce) to Testnet and RegTest?
No, due to various reasons such as different address format & genesis block on testnet are different.
Thanks, I used source code to generate Genesisblock hash, with different PCH message and other values for all three.
For Mainnet and TestNet it crated same Nounce, Markel and Genesis Hash values. But different values for RegTest.