Is there any difference between a phono cable and a regular interconnector?

Almost all "phono" cables are shielded.  If you used the Kimber Kable PBJ or any other of their twisted-like cable, they are not shielded.

As mentioned above, you would need to connect the ground wire somewhere.

Although shielded cables can eliminate hum/noise, not all turntables need shielded.  In My experience, shielded cable always sounds more "closed in" than does non shileded.

Connect a earth wire. If you have some video cables try those as they are shielded. Remember you need shielded cables from your TT because the signal from the cartridge is so small that many things can affect the sound. It also depends how close the TT is to things like speakers and TVs.

Phono cables **might** differ from regular cables in two ways. First, they are usually shielded. Second, they usually are low capacitance.

Dear  sfeizif215: I used for several years the KK KCAG ( unshielded. ) as a phono cable with extraordinary results.

Now, you have to check internally the TT ground conection and if broken you just change it.
In the other side your KK phono cables  must be away from transformers that comes in electronic audio items and has to stay away from electrical power cables and does not run parallel to this kind of power cables.
If you can try that the tonearm stay grounded too.
If hum persist then change the KK position. You can check ( live. ) in what position ( between TT and phono syage ) that hum goes down and fix it there. Sometimes we have to change the TT position because of that hum.

Btw, which kind/model of TT are you using? sometimes it's through the cartridge that that hum comes because it pick up from the TT motor that can comes with bad shielding.

Regards and enjoy the music,
R.