Yes, both MPs (actually set of MPs) can be imported in SCOM simultaneously and monitor both hypervisors. Hyper-V MP requires Virtualization Extensions Management Serivce (VES) to function properly and the same VES can manage VMware Collectors responsible for vSphere data collection.
So, a single VES can manage both vSphere data collection via Collectors and Hyper-V monitoring via SCOM agents installed on Hyper-v hosts. You will need a license with both hypervisors though, for the current version it cannot be two separate licenses.
Let me know if you have any other questions.