Yes, but do it at a year end if you possibly can. Migration tools and conversion services move the core data — customers, suppliers, chart of accounts, and usually a couple of years of transactions — but the things that do not carry across are the things you built: bank rules, invoice templates, recurring transactions, tracking structures, and any app integrations, all of which need rebuilding. Reconciled bank history and attachments often transfer imperfectly too. The honest counsel is that switching mid-year for a feature you want is rarely worth the disruption, and switching because your accountant prefers the other one is a bad reason. If your current package genuinely does not do something you need, though, the pain is finite and front-loaded.