No, Andy they are not the same as regular ZT/R75 at all. The ones I have are for the V8 but Rover 75 V8 spec (softer?), not MGZT-260 spec.; should have been more explicit, sorry!
Edit: Noted that Rimmers only quote one number (R75V8 vs. MGZT-260) but the parts list says different. Indeed my springs have the parts list number which differs from Rimmers.
David