Yes, any three door Uno seats will go into any other Uno. Rear seat is the same regardless of model (five door models included), all have the same fixings. Turbo seats will fit into non-turbo models and vice versa.
The only seats that will give you problems are the front seats from 5 door models as they don't have the tilt forward mechanism. They will, however, still fit a 3 door but you'll have to climb in through the boot to get to the back seats
Mk2 turbo seat are grey in colour with side bolsters. Mk1 turbo seats are similar in design but are in black/ charcoal, and have slightly different design cloth inserts depending on the year.
Seats from other Fiat models can be made to fit, but you'll probably have to get seat subframes made up.