Would not bother me which one to choose if I liked what I saw and was happy with the price asked........I am a mechanical engineer and like Cooperman to me a steel Mk1 bodyshell original or replacement but correct in nearly every detail worth worrying about is just the same steel body component whether it came down the production line at a different time or not. It is not a living organism it is a lifeless steel bodyshell, a component part of a car and I personally think there really are far more important things to worry about even if you are a complete classic car nut or Mini anorak like me........but as ever each to their own opinion.
So that is someone else who thinks like me.
I think my problem is that I was around the Mini since 1961 and have rallied them, prepared them, repaired them and re-shelled them going right back to about 1964. When rallying in top-level events in the 60's and there was a crash the comment "Oh dear, that means I'll have to find a new shell then" was commonly heard and not only in respect of Minis. I had a huge accident on the 1969 Scottish Rally in a Mk.1 Lotus-Cortina. The driver, who owned the car got a used 2-door body-shell from a Ford dealer, had the shell re-prepped and the Cortina was re-built and used again. It is an ex-works car and is still about today and is worth a fortune.
Virtually every competition Mini was re-shelled. Take the famous Mini 24PK. That was re-shelled after the 1964 Manx Rally using a used 850 shell. In fact, can you actually find an ex-works Mini which was not re-shelled.
It's a lot of fuss about nothing and re-shelling is widely accepted within the classic car movement. Get used to it. These cars are not recreations, they are simply comprehensively restored to original mechanical specification.
My own Cooper 'S' rally car was re-shelled with a 1965 shell from an 850 when I restored it in 1991. In fact the original shell was later jig-re-built and used in a 998 Cooper restoration then turned into a rally 970 'S'.
The shells are all identical, so what is the issue. Is it OK to change the sub-frames, fit a different block, crank and gearbox, fit different wheels, change the seats for competition ones, fit plastic windows, but not OK to fit a replacement identical shell? That makes no sense at all.