Mk2 radiator hoses are different but you can use either depending on what else is in the engine bay.
Mk2 top hose is "S" shaped while Mk1 is more of an "L". I think its to get around the different AFM and injector cooling hoses etc
Bottom hose is the same afaik
Mk2 rear (corner) hose has an inlet from the header tank built in. Mk1 is just a 90 deg bend. The mk2 system is better IMO.