I think it is likely to work - BUT, the assembly and disassembly will be (at lest) challenging.
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The thermistors may be similar, and possibly the thermistor board in the cartridge (you need to check this carefully before you start.? If the cartridge are the same, it would be straight forward,? if only the thermistor board is the same it will be a bit more difficult.? It might be reasonable o pick up a dead 8481 to practice disassembly on.
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HP did sell the cartridges some time ago but they found that many attempts to replace the cartridges resulted in damage to the matching components in the head.
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I would look carefully at the part list for the 8485 to get an idea as to how difficult the disassembly / reassembly will be.? It is relatively easy to get the cartridge out of the 8481,??
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keep us posted as to how it works out - pictures would be very desirable.
