As refer to your pics your 4004MKII not only the resistors were replaced, but also the Motorola IC amp were replaced by 2 transistors!
If you insist to sell the 18K and 4004MKII together, this is very difficult to find a buyer to accept both your 18K but defective 4004MKII.
Hence, why don't you sell your 18K to me and set a attractive price for your 4004MKII and see someone may accept the minor defects of your 4004MKII at a below market price.