Could you be a little more specific about which parts you have in mind?
There's over 4800 parts in a 1970 beetle

The front and rear guards will swap, but the fronts will have no bumper mounting holes and the rears will have them too low and too small.

My 70 bug had 62 gaurds when I bought it but unless you also weld on the early front apron to fit the early bonnet they look abit silly.

I have a set of front guards from a 70 that has the old style headlights and no blinkers if your interested.