No way. Not possible in anyway shape or form!

yep that would be a feat to see if someone tried it
by design and structurally impossible without extensive modifications which would cost more than the mast is worth and most importantly would most certainly not be recommended or approved by the manufacturer.
If your desire to swap masts are based around changing height or operating arrangements there are probably options available to achieve whatever goals you are wanting to achieve.
You just need to identify what goals you are trying to achieve on the main truck your wanting to change and see if those options are available for that truck/mast.
But just to be clear:
Based on what the differences between the two trucks mast assemblies are, the RD model is a solid mounted (fixed position) mast with a pentograph reach assy with the tilt and sideshifter built into the carriage mounted on the pentograph which is a design made for narrow aisle trucks, the RC model is a mast mounted on lower pivots (a movable position mast) and has tilt cylinders used for mounting and tilting and has no reach option, the design is more off the base of a conventional warehouse truck design.
The only similarity between the two trucks is they both are designed for stand up operation, but one clearly has an advantage over the other with the reach option and can actually maneuver in tighter spaces (such as narrow aisles between racks) than the other, The RC truck is for more general warehouse operation in open spaces and truck loading and unloading.

But just to repeat what Popeye said, no you cannot swap these masts.

Perfect, that's what I needed to know. Thank you.

All CROWN lifts are married to their masts. No masts are interchangeable according to CROWN. However... if the lift year, model, capacity, mast collapsed and max lift heights and carriage are the same i see no reason masts cant be swapped.

Have a good day seem to have an issue w/FAC and had a double post of the same old song.

OSHA says all changes to a truck must be approved by the manufacture and/or their authorized agents - there are beaucoup Crown company owned stores & those branch managers aren't going to buck the "head shed" folks in New Bremen

Crown Reach & OP , Walkie Stackers units are welded on - the only unit where a mast swap "might" be physical possible are electric counterbalanced sit down rider balanced style units, stand up counterbalanced RC, walkie counterbalanced stackers and the ICE C-5 line. But if big Daddy Crown says no swaps allowed then you are screwed.

With all that being said the likely hood of any real need to swag mast by an authorized Crown lift truck dealer is minuscule.

I'm thinking about cannibalizing a mast from a counterbalance unit to make a fork arrangement, to be tractor mounted on the rear of a similarly massive tractor, with at least double the width and significantly more counterbalance fulcrum length.

I don't expect to get a gold star from Crown, but what do you guys think about that? I would definitely not be operating this moving while the mast is raised, and would never use it to lift above 5 feet while near capacity.

You know the answer without asking.

Depends. Are you a redneck? Yes it no.

lol yidneck
but you got a point, i knew a guy lived in the country, he turned a volkswagon into a drag car, put a 429 in the rear of it lol
He also made a suicide shifter and mounted it on a harley 1200 panhead
so i guess anything's possible if you have the determination and resources to do it. :oD
Is it safe? probably not but back then we didn't care or even think about that, we just had fun doing stuff like that ;o)

Should he mount a mast on another tractor? if he knows how then i suppose he could. We did alot of strange modifications in our shop back when i worked for cat back in the 80's. But we also got the factory to certify it so that's the difference i guess.

I guess a lot of it boils down to who are you making it for. Never make it for a customer cause of liability issues. But if it's for your own personal use, well.... I still say don't do it cause I don't want a lawsuit.

Oh Lord no, I probably won't even let my friends operate it. I'm mostly just interested in having the option to deploy outriggers and lift a cage for access to trees, and pole barn barn rafters, yard lights etc. I got the trucks under scrap price, so if I can't get them all running for friends, I'll have at least one without control circuits and I'm not sure I want to pay for those. Might as well just grab a few more old trucks and pray for alternate rec failures. I'm not sure I can call myself a redneck, definitely a hillbilly though.