What would you consider being "a lot of modification"?

How much metalwork experience do you have?

The shape/size of the two dashes are different, not just with respect to the two windshield openings.

There are at least 25 spot-welds in each dash/cab that will have to be cut out.

The donor dash would have to be fitted and then welded into place.

Maybe someone who has accomplished/attempted this will respond. That would be the best information for you to consider.