It think that both these pics are LeMans Green , even though they look different. I have never seen BRG on the MG yet but I have seen Le Mans in the flesh and it is more like your second pic than your first. See pic attached
MGR are causing confusion, as your picture is according to the Exeter dealership BRG metallic. LeMans green is supposed to be a solid lighter colour like my first one. To my eyes there is a big difference in the two I sent, the second being the same as your ZR pic. In the 1st place your ZR was called LeMans green, then they changed it to BRG now it seems it has possibly gone back to LeMans green, as I have just looked at the MGR site and I can't find any of the new colours on there. ?"$£%^$"!
Dont be fooled by the MG Website which has the MGs Xpower cars green as Lemans in the colour chart. I have the first MG brochure which shows Lemans as the colour in the pics I have attached. BRG will be a darker colour as per MGF or Rovers. I have no idea why the colour is wrong on the website but then they only had the new colours in the ZT section for a while and now they are gone again.