I take along a tape measure when initially looking for a new car.
I don’t go by litres.
The Tiguan has a bigger boot and a wider opening then the kuga, not only can you slide the back seats but you can adjust the back rake so you can fit Larger squarer items in. it also has more head and leg room for back seat passengers. Plus the rear doors open wider.
But the kuga is an older design.
The only ford I may have ordered was the galaxy but it was overkill for what I need.