hey, anyone can gimme a hint how to deploy the same contract on BSC & ERC using the same CA?

You want the same contract address to be deployed on different chains? Use create2. OZ has a nice toolkit to help you.

Correct

Do I need to watch out for the nonce?

Create2 is your friend, hence

Read sth about it but need to dive deeper

Nope, as with create2 will use a salt provided by you, instead of using your nonce. So, you ll have a better control on targeted address. (That does not mean that you can choose your target address)

Ok. Need to check for it. Thx a lot