Myself and a few other members (as per what they have mentioned in https://www.blackhatworld.com/forums/google-ads.83/ threads), have used the same payment method (same card, same vcc), in more than one Google Ads account. But these are in churn & burn threshold accounts, which is also sometimes a "hit or miss". But if you are going to use the Google Ads accounts on a long term basis, then in that case it is better to avoid using the same payment method (same card, same vcc, etc) in multiple Google Ads accounts.