Thank you for getting in touch. The NP-32 is part of our home keyboard range. It has fewer keys than our digital pianos (76 compared to 88 on a piano) and the keys aren't weighted. The NP-32 doesn't come with a sustain pedal but is compatible with our FC5A, FC4A and FC3A pedals (the FC3A offering half-damper recognition). Our L-2C keyboard stand is suitable for the NP-32 (links below).
In comparison, the P-45 is part of our P Series Digital Piano range. It features a full-length, full size keyboard with fully weighted and graded keys (it has our Graded Hammer Standard key action under the keys so that it feels very much like an acoustic piano to play - essential for anyone learning to play piano rather than keyboard).
As well as differing keys and accessories, the P-45 has superb sound quality which is richer and more realistic than the piano sound from the NP-32. Generally, for anyone learning or wanting to learn piano, we'd strongly recommend the P-45 or another P Series or Clavinova Series piano. For somebody who already has a piano but needs something more portable and compact, the NP-32 is an excellent choice.