Similar but yet different. Also the exchanges may appear similar to your eyes, but if you look carefully they are both different. Do a side-by side comparison and you will see for yourself.
Please read the features of the ImpulsX exchange and you will know it is not the same as IronX.
Mainly that ImpulsX is a cryptocurrency exchange making use of Global Order Books to facilitate fast trading and high liquidity. IronX doesn't mention this anywhere on their website.
Also IPX token will be able to be proof of stake (PoS) in themselves securing their own network. IRX don't mention this for their token.
40% of the net-profit of ImpulsX will be used to facilitate a buyback and burn program. This means that the more profit is generated, the more IPX tokens will be pulled of the market, which in turn means an increase of the price of the IPX token over time.
IronX doesn't mention anything about this either.
These are just some of the differences out there.