To use the same account or wallet address from one Metamask to another Metamask is just simple. All you need to have is your seed phrase. You can also use a QR code to do it(this option is currently unavailable).
Some reasons why you want to do this:
1. Use the same Metamask on both PC and mobile or tablet
2. Play NFT games such as PVU both on PC and mobile
3. PC crashed or mobile phone lost
Here is how to login the same Metamask account to another device
1. Open your new Metamask wallet installed on your browser, App, or another extension.
2. Click on Import wallet using Secret Recovery Phrase.
3. Enter your seed phrase. When typing manually, use spaces after typing each word in the phrase.
How and where to get your Metamask seed phrase(Secret Recovery Phrase)
1. When you first sign up for your wallet, Metamask asked you to write down the phrase so you could have this phrase somewhere in your pockets, wallets, screenshots, etc.
2. You can recover this phrase if you still have access to your Metamask extension.
3. Enter your current password and you’re done.
Open your Metamask extension >Click account icon> Settings > Privacy and Security> Reveal Secret Recovery Phrase> Enter Metamask password.