A corporate relocation package combines the financial benefits you offer to an employee and its support. Financial benefits might include household goods moving, temporary accommodation, and the final trip.
The support part is personalized and occurs during employee relocation. It may be offered by an RMC that offers employee relocation services, or it might be HR itself.
You can still offer employee relocation allowances, but you should add the relocation services support noted above. You can offer a more defined corporate relocation package or a mix between an allowance and a defined benefit if you want. What you do depends on how hard your company is looking for talent.