Can QMM be used to migrate source Hybrid environments?

Company A just bought out Company B. Company A and B both have their own on-prem AD/Exchange hybrid configurations with their own Microsoft 365 tenants. Both companies Primary SMTP domains are different.

Can QMM be used by itself or is both QMM and OnDemmand required if that is an option?

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  • Can QMM be used by itself or is both QMM and OnDemmand required if that is an option?
    1. QMM EX can only migrate On-prem mailboxes and Public folders from Company B to Company A On-prem Exchange or Exchange Online
    2. On Demand Migration for Email can migrate both Company B's On-prem and Exchange Online mailboxes to Company A's On-prem or EXO
    3. On Demand Migration can migrate Company B's EXO  mailboxes and public folders to Company A's EXO, and can migrate SPO, ODfB, Teams, M365 Groups and Public folders. 

    To the simply answer Yes, No and Depends.