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.
"There is no such thing as the real mind. Ridding yourself of delusion: that's the real mind."
(Sheng-yen: Getting the Buddha Mind, p 73)
“Don’t rashly seek the true Buddha;
True Buddha can’t be found.
Does marvelous nature and spirit
Need tempering or refinement?
Mind is this mind carefree;
This face, the face at birth."
(Nanyue Mingzan: Enjoying the Way, tr. Jeff Shore; T51n2076, p461b24-26)