Spec-wise it's the same as the Verizon model, but the radio bands are different. Taken from FCC docs (bolded bands used by the respective carrier):
Verizon XT1528:
GSM and HSPA+ on 850MHz, 1900MHz, 1700MHz/2100MHz.
CDMA on Bands 0 and 1.
LTE on Bands 2, 4, 5, 13.
Sprint XT1526:
GSM and HSPA+...