Yes, back spacing might be the same..... The 80 rim is 8" wide instead of 7". This extra width, with the same backspacing, is outside of the wheel mount surface. Because you push the outer tire seat 1" further out it pulls the tire further to the outside/away from the upper control arm. This is why some wheel people talk in offset rather then backspacing.
2004 4runner just starting to build
83 Hilux SR5 is being sold
94 pickup in a pile of parts