We have investigated resistive transitions of a axis YBa₂Cu₃O₇/a,b axis PrBa₂Cu₃O₇ superlattices in a magnetic field to study the correlation length of vortices along the a axis direction of YBa₂Cu₃O₇ across an a,b-axis oriented PrBa₂Cu₃O₇ barrier. The correlation of vortices across up to 480 Å of PrBa₂Cu₃O₇ is evidence consistent with long proximity coupling coherence lengths in PrBa₂Cu₃O₇ found in sandwich type YBa₂Cu₃O₇/PrBa₂Cu₃O₇/YBa₂Cu₃O₇ Josephson junctions. Investigation of a-b plane and b axis transport of undoped and cobalt doped PrBa₂Cu₃O₇ films suggests that a long localization length along the b axis of PrBa₂Cu₃O₇ is the origin of this long range proximity coupling.