I would firstly change the CTS, I do mine every 2 years, as said you cannot mix and match injectors though, it may well pass the mot at idle emissions, but overall fuelling will be way off, so you need to know what chip it is first and suit the chip injectors to each other, would be just as easy to get a set of 0280 150 803's or dark greens as they are known as.
tabetha