There is confusion/misunderstanding here.
The 13B never had a 'dual' crank pulley. The very last 1995+ 3BIIs, 14Bs and all 15B-F/-FTs had dual belt pulleys, but these were much narrower belts and were never used on a Landcruiser.
The bare metal pulley you show in your pictures is not an original part and is the source of the problem. Not the 3BII hardware. How does it attach to the crankshaft harmonic balancer pulley?
The black single pulley on the 3BII which you are comparing to the non original bare metal pulley is not for the AC compressor, it is a power steering belt pulley.
The 13B setup you show has an aftermarket compressor which in addition to not being an original NippnDenso compressor, is also not the correct design for the engine. So it's very likely that the AC compressor pulley does not correctly line up with with where the crank-mounted AC compressor belt pulley is meant to go. You also don't have the original AC compressor bracket and tensioner bracket, and those parts are not easy to find (though easier for the old stlye of engine like a 13B than the newer 3BII/14B architecture).
Here are the correct pieces for a 3BII / 14B. Single belt harmonic balancer/crank pulley 13470-58060, the AC compressor belt pulley 88451-25020 and the power steerining pump belt pulley. The first two items are still available. If the vehicle had no AC, the spacer disc was installed to make up for the missing AC compressor belt pulley.
This is the part you want, assuming an original ND 10PA15 compressor and mounting bracket.
This is what they should look like in profile.
The only thing I am unsure about is whether the 3BII/14B crank pulley will fit the 13B crankshaft. You could either buy and test, or take off your 3BII pulley and try it on the 13B. But the AC and power steering pulleys are common to both the 13B and 3BII, there is no difference in bolt spacing on the factory parts.
If you are fitting an AC system cobbled together from unknown/home-made parts, you will need to be your own engineer and make things line up properly. My 3BII came with a similar setup which I threw stright in the junk and then set about the long journey of finding the correct parts.