The rad on my rs turbo has just sprung a leak

I have a series 1 rs, but i'm not sure whether I have a s1 or s2 rad as the car has a water cooled turbo?!

Can anyone tell me how to identify whether it is a series one rad or a series 2 item and does it matter which one I get to replace it?

Thanks for any help

 

the s2 rad has a water outlet to the turbo above the bottom hose outlet.

 

I thought this, but then i saw a picture of a series 1 rad on ebay which looked like it has the outlet aswell, maybe it is blanked on the series 1?

 

on my series 1 i have the outlet, but it is blanked off

I got the rad re-cored for £35 with 1yrs mot, looks like new