The cheaper priced one is the ‘Super’ trim level.
The more expensive one I believe is the ‘NE’ or ‘Special’ trim level.
Even Alfa on their own website don’t clearly state what trim level the more expensive one is though:
https://www.alfaromeo.co.uk/promotions/Giulia_Motability
Perhaps a phone call to Alfa UK can clear it up or if you are a twitterer as them at @AlfaCareUK
https://www.alfaromeo.co.uk/mopar/customer-service-alfa-romeo
Dave