Same Heater core?

Long ago I removed the heater core in my 69 Dart Custom w/ AC. As I recall, it sits inside the AC evaporator (closer to firewall), so Dan sounds correct about same PN as non-AC. Mine was not leaking, but was getting condensate on the floor. The galvanized pan below the heater core was corroded thru. Condensate wasn't draining properly because the copper drain tube thru the firewall had been bent up, perhaps when I removed the engine (was a gomer then). Some here have speculated that the different water pump (6 vs 8 blades) between AC and non-AC cars is due to the pulleys being different diameters. Might apply just to V-8 and not slant six.