Proximity effect in\({\mathrm{YBa}}_{2}\( {\mathrm{Cu}}_{3}\) {\mathrm{O}}_{7}\)/$ {\mathrm{Y}}_{0.6}\( {\mathrm{Pr}}_{0.4}\) {\mathrm{Ba}}_{2}\( {\mathrm{Cu}}_{3}\) {\mathrm{O}}_{7}$/\({\mathrm{YBa}}_{2}\( {\mathrm{Cu}}_{3}\) {\mathrm{O}}_{7}\)junctions