Jodo Shinshu is an offshoot of Honen's teachings, and instead of emphasising the practice of nenbutsu it points to faith, shinjin, as the essential requirement of birth in the Pure Land. I don't see that there is a big difference otherwise. As for other practices, they are not important at all, although not forbidden either as long as they strengthen one's faith.
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)