Hi Can you tell from a wallet address what network it is on?
You can track it through use debank. It will tell you which network that address was available. You can also easily track in what blockchain you have stored your money. It will be very useful as it has been also conneting to the all of available blockchain this time.
Just like this
https://debank.com/profile/0xeb2eb5c68156250c368914761bb8f1208d56acd0that address was just an example.

Is there a difference between the Ethereum Network and the BNB Network, if so how can you tell?
If you meant native BNB network and there is different, but if you meant BSC network and it's EVM compliant. You can use ethereum address in binance BSC blockchain but not for BNB native blockchain. Binance has two blockchains, binance BSC and Binance native.
These blockchains used different mechanism.