Hi Can you tell from a wallet address what network it is on?
You can try entering the address on Block explorers that support multiple chains, like Blockchair.com. You will be able to see options of possible blockchains under the search results.
Is there a difference between the Ethereum Network and the BNB Network, if so how can you tell?
The two are different networks, but both are
EVM Compatible Blockchains, Ethereum and BSC are just two of them, there's Avalanche, Optimism, Fantom etc
These networks can use a similar or the same address, and you can also use
https://platform.arkhamintelligence.com to find out which networks have funds in the address.