I have closed one business and now seeing the same clients at my new business. If they already left a Google review at the closed location and leave another Google Review at my new business will this negatively affect my ranking?
Yes, it’s fine. Actually, they should write a Google review if they have dealt with you at the new business.
I’d just advise them not to copy and paste the old review (so it’s not identical).
You can also check these articles to learn more about Google Reviews: