Yes you can have all of them under a single vCenter.
All the features such as HA, DRS et care common to both licenses so you don't have to worry about that. Lot of features like storage DRS, Storage I/O etc will be extra in Enterprise plus.
One important thing to note is that distributed switch is only possible for enterprise plus licensed hosts. So as far as you are concerned with just the overlapping features, you will not run into any issues.
Even if you need to use the advanced features, you will have to put the hosts into separate clusters.
Here's a comparison link for both the licenses.
Compare VMware vSphere Editions and Kits Comparison | VMware India