Some blocks will work and some wont. The blocks toward the front are the same between the tudor and roadster. The rear block(s) are different. I attached a diagram of the 10 body blocks need for a 28/29 roadster and the 7 blocks needed for a tudor. It appears only the front and the 3rd block back for the roadster are the same between the tudor and roadster.
Rusty
Note: I misread your post. I thought you were referring to a roadster. I believe that there are only 6 blocks used on a roadster pu. The first set of blocks are the same on all 28/29 vehicles. The last 2 sets are different for a roadster pickup than for a tudor. Sorry for the misreading.