2022
Don't know about the web version, but mobile (android) there is a "thumbs up" and "share" option under every review.
With this, you can send a link to a review by mail or any messenger for example.
There is no possibility to link directly to your review of a location, you can only link to the store where your answer will be displayed. At the beginning of a spot you can save it, send it to another phone of create a link that you can share with your friends.
Google adds features like they want, when they want, don't know if such a feature will be available at a time. at least this is what I see on the iOS Version on my iPhone.
UPDATE
After updating the Google Maps App for iOS at the end of February, I found a new feature that helps you to share exactly your review and not the whole location.
There will appear a screen after writing a review or adding images. You can share directly from there what you added.