The seats appear to be retrimmed Scheel seats originally fitted OEM to the Australian RS2000's.
The photos appear to show an Australian assembled 2 door RS2000.
Therefor the seats do comply as original fitment.
Should your engineer doubt the correct fitment, place the onus on him to provide proof the seats are not correct, and provide exact details why they should fail engineering from a structural perspective.
Also you can check with any of the Escort car clubs near you to confirm.
If you wish i can provide a photo of the seats in my RS2000 I have owned continuously since delivered to me brand new in May 1980.
Re the tilt forward lever.
The earlier versions of the Scheel seats had the tilt forward lever at the base of the seat as shown in your photos.
Later build seats the lever was relocated half way up the side of the seat.
ALL Australian build RS2000's had the tilt forward levers fitted irrespective whether 2 door or 4 door car.