The Brazilian Uno was always different to the rest-of-the-world Uno, being based mainly on the special version of the 127 developed for Brazil with the 1050cc engine. The Citivan (or Penny) - a sort of Uno estate - has 127-derived rear suspension.
The spare wheel under the bonnet was always a Brazilian feature (though you have to remember the FIAT 128 had it there as well...)
The bodyshell is identifiable by the clamshell bonnet (folded over at the sides). Although the slimmer headlights on late 80's models may look like an Uno Mk2, they are not the same and the bodyshell always remained different. It looks like the Nuovo Mille is a development of the Brazilian Uno, though it appears to now have a FIRE engine?
-Alex