No-one but a Landy nut can pick the difference between a 1985 County and a 2006 Defender. There are subtleties such as roof design (ribs on older models) and blanked-out air vents (but could be easily body-coloured for filming) as well as door handles. It's not like the difference between Jeep models, for example. May average people can't pick the difference between a Series vehicle and the current model, because the basic profile is unchanged since 1958.
I would think though, that if there is a continuity match required with another vehicle, that 1991-2006 would be the acceptable range. The earlier models have enough differences that they would be detected side-by-side. In the range mentioned, the only visual changes were that some years used body-coloured roofs and some used white - but a white vehicle gets around this. AFAIK all white Defenders have black wheel arch extensions. The only subtle difference is that some will have factory air and some aftermarket - the difference is an inch forward or back on the grill location. I doubt the average punter could pick that, even side-by-side. Matching the accessories might be trickier.
Steve
2003 Discovery 2a
In better care:
1992 Defender
1963 Series IIa Ambulance
1977 Series III Ex-Army
1988 County V8
1981 V8 Series 3 "Stage 1"
REMLR No. 215
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