It's impossible to make PU's that sound identical to each other, because of slight variations in materials, wind tension, and wind patterns. Plus even the same PU will sound different in one guitar to the next, because of the woods and guitar design. 490's are high quality PU's regardless, and some will sound pretty good with the right guitar/amp. But I think you'd always be able to improve on the tone with some of Duncan's PAF's. If you're happy with your 490's no, you don't need to spend any more money on PU's.