Reuse CRM Service Accounts

Is it supported or a good idea to reuse service accounts on two installations of CRM in the same domain? I have two completely separate installs, one for dev (with a CRM server and a SQL Server) and one for prod (with it's own CRM Server and SQL Server). Can I use the same service accounts for the async service and sandbox service or will it cause problems. Unless I have overlooked it, I can't find anything in the documentation about it.