Hmm, maybe it's just me but I don't think they sound too much alike. It's definitely not like Will.I.Am's rip off!
I am quite surprised that no one has really mentioned this yet anywhere, but I think When You Love Someone (Club Mix) by Dankann & Antillas sounds a lot like Trio by Arty. Poor Arty..getting ripped off left and right! haha
I hear what you mean Randy, never heard the similarity until you mentionned it. But it certainly is there. On the other hand tho, doesn't Kate also sound very much like an older track? Can't think of the name right now tho.