one mashed radiator

This sorry looking radiator even though it doesnt leak cant be trusted, its corroded to the point that bits have turned to powder, fixing points cracked. so luckily Kempton Park bike jumble was on again, excellent place that Ive mentioned before. this time there was a classic bike show on. just by chance I spotted a radiator which looked very similar. With my measuring tape I checked the length,breadth, height inlet,outlet. even though it said gpz600 on it it looked ok. Infact they were the same. So whether honda and Kawasaki use the same parts or it was marked up wrong.