Simple - drill the spot welds out of each steering column support, swap the one you need over. If you don't have access to a welder (recommended), you could bolt the support in, just use high quality hardware and locking nuts. (Mind you this was about 14 years ago and I've forgotten quite a bit, but I'm pretty sure the booster needs to be pulled to do this as the 4 bolts capture the column bracket. No biggie.)
Pic is showing the new support mocked up and old one on the floor; not secured yet. I did this exact swap years ago when I built my '94 3500HD.
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After a lot of other work, cab floor surface rust addressed with POR-15 and the cab itself painted black, pic shows installed column support and 95-up column
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BTW since you're a '94 cab with '95-up interior, same thing goes for the passenger A-pillar grab handle. It's difficult to reach some of the spot welds on the bracket to drill them out because the windshield is in the way, but since your newer model cab is crushed, just sawzall the section of the pillar out and throw it on the drill press. Before chopping it out, make a simple template using the trim clip holes on the pillar to locate it properly on the '94 cab before welding it in.
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Richard