Depending what year KE36 you have, the KE70 brakes will be an upgrade.
Both 180mm diameter discs. But where the 75-mid 77 KE3x's have 10mm thick rotors, the Mid 77 -79, KE55 and KE70 have slightly thicker rotors.
And the early KE3x's will have sumitomo where as the later KE3x's, 55's and 70's run a PBR caliper.