Two google accounts both manage our business profile, can I merge them?

Before you remove the second account, check whether anything else hangs off it, like Google Ads, Merchant Center or the reviews reply notifications going to that inbox. Move those over to the account you're keeping first. Turn on 2-step verification on the one you keep, since it's now the only way in.

Google accounts can't be merged. Make the one you want to keep primary owner under people and access, then remove the other. Do it in that order or you can lock yourselves out.