CO2 Emissions on 200s

Hi Guys,

was looking at clio 200s, but something I noticed was some has emissions of 195g/km and others are 190g/km.

You probably think this is a strange observation but I'm looking to import one to Ireland and the 5 extra g/km of the 195 means i'll be paying an annual road tax of €1,200 s opposed to 190g/km being €750, I was originally put off them if I had to pay over a grand tax a year but could stomach the 750.

So my question is why are some different, was their an engine revision at some stage or are there differences in some models?

Thanks.
 
195g is for Euro4 engines up to model year 2010. Since 2011 Euro5 was required and at that point emissions were dropped to 190g.