Office 365 Small Business Premium + Exchange Online, USE same domain for both

Hi,

In our office we have 5 users so we plan to buy:

2 x Office 365 Small Business Premium for our office 

3 x Exchange online 

I know that these are from different product families ,

If i buy them from separate accounts, will i be able to use same domain ( for ex myCompanyDomain.com) for the e-mail adresses in both of these accounts?

Thanks