>>2845557here's another 'perspective'.
a higher focal length lens has less 'bending power'
a large sensor on a higher focal length lens projects a smaller angled cone of FOV
at a particular sensor size/focal length/distance ratio, a small sensor and large sensor cone will intercept.
this is the point where a subject would be framed 'the same' between the two systems.
however behind or infront of this plane the cone diverges and thus the perspective