Upload sketch to 328 with 32u4

I forgot my USB cable to program my 328 arduino but I have a 32u4 here with a USB cable, anyway I can use that to load sketches onto the 328? Before you say it, it's not a Leonardo it's my own breadboarded 32u4 so I can't just use the same cable

arduino isp code in IDE. load it to your 32u4. you'll lose 328's bootloader I think.