Hi

I want to claim the free bitcoin gold I have recieved in the fork. But before importing the private key into a wallet, I want to check my balance.
I entered my BTC address into btgexp.com and btgexplorer.com. None of them worked.
Then I found out Bicoin gold address is different from Bitcoin address, while Bitcoin Cash address is the same as Bitcoin address.

What is the difference between bitcoin cash and Bitcoin gold which causes Bitcoin cash address is same as Bitcoin address, but Bitcoin gold address is different from that?

How can I check my Bitcoin gold balance and how can I find the address which contains my free coins?
( I don't want to import the private key into a wallet and just I want to check my balance)