Thanks for writing in with your questions. Both these events require that you can go uphill well. So, even though one is a running race and the other mountaineering, most of the training for one will carry over to the other. You’ve made a good choice to use the Big Vert plan. Be sure to rest well after the race before you begin training again for Whitney. I’d recommend 7-12 days very light exercise and minimal running after the race. Use cross training like cycling. As soon as your legs feel decent again see if you have time to get in 2-4 weighted uphill pack carries as explained in out article on ME training.
Good luck.
Scott