Series 22 and Horizon Racing Car Pack in Forza Horizon 5 give me another reason to update the first post.
Among 7 #NewToForza cars added with update and DLC, there are three models very likely to be featured in Forza Motorsport (Mercedes-AMG GT Black Series, Pagani Huayra R, and Formula Drift Nissan Z '23), as well as two less likely (Forsberg Racing Nissan ‘Altimaniac’ and Formula Drift #51 Nissan 240SX '96).
Oh, and Lotus Emira turned out to be a Horizon car first and Motorsport later (similarly to Porsche Mission R and Porsche 935 '19 which I forgot to mention in the first post earlier).