Yes. A few years back i had a tin of blue that was actually green, and it was the best antifoul Ive ever used. Altex refunded me, and once in the water, the paint below the waterline went pale blue after a few months.
A little birdie told me that was a faulty manufacturing batch with faaaar too much copper in it, which is what made it green.
So it wouldnt surprise me if sea green 5 plus is a superior product, as I think ive already sampled a trial batch!