Office 365 Home Premium - downgrade to Office 2010 Pro for 1 Vista PC

Hi,

I have scouted various knowledgebases including here and can't seem to find direct answers to my questions....

We have a client with a number of PC's having various OS/Office install combinations. The plan is to deploy Office 365 Home Premium and bring all/most to a common Office platform. The PC's include:

1. Win8 Pro/Office 2013 Pro Plus Trial

2. Win7 HP /Office 2010 Starter

3. Win7 HP/Office 2010 Pro

4. Win Vista SP2/Office 2007 Pro

I'm uncertain how to deal with 2 things:

1. Can I just do a direct upgrade/insert key to activate 2013 with 365 HP license (as they are essentially the same)

4. Can I downgrade the assigned 365HP license to 2010 Pro, if so what is required/what needs to be arranged?

Thanks

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