I could be wicked and say click here: [url=http://bit.ly/1ce3vXZ'>Click![/url'>
But I'll just say, yes, they're the same thing, assuming that the intended use is as a thickening agent. In the UK it's called cornflour, in the US it's called cornstarch.
The US has cornflour as well, but it's a different product (finely ground corn) for a different use.
<em>edited by Madge_Gustard on 11/11/2013</em>