66’ style PS box to 72’ style

Did not know how to phrase this.

basically I had firm feel rebuild my 1972’ steering box for use in my 66’ Early A car. I’m using a 72’ style power steering pump (Saginaw style with the 3/8” return line) on a 318. So with that said, with the original 273 rebuilt now I want to install it back in the car with the factory Thompson pump. Anyhow- can I just unbolt the top of the steering box (aluminum part with 2 bolts ) from the 66’ with the small pressure hose (#4jic) and 1/2” return line and swap it over to the 72’ box removing the 3/8 return and #6 pressure top?

Do I need to worry about anything doing this? I’ve yet to have the boxes side by side.
I’m trying to get the 66’ back to all 66’ but hate to have to wait another 12 weeks for the 66’ box to be rebuilt.
Thanks!
Syleng1