there are two possible approaches for Salesforce org strategy: single-org and multi-org. Each approach has its pros and cons depending on the business needs, technology capabilities, governance policies, and operational requirements of the organization.
The best recommendation for the CIO is to prioritize completing an in-depth org strategy analysis, focused on the Business, Technology, Governance, and Operations requirements at SharpField. This should include an assessment of the newly acquired company and any other acquisitions that SharpField is considering. Additionally, the Solution Architect should recommend a single-org strategy and the development of strict processes for all acquired companies to follow. This will ensure that the Salesforce environment is organized, integrated, and secure. Finally, the Solution Architect should recommend the development of required integration layers to move the required shared data between instances of any and all acquired Salesforce instances.
https://www.salesforce.org/blog/develop-a-salesforce-org-strategy-to-achieve-a-unified-experience/