We go the hallway done in Little Greene company's paint which was lovely and totally could not be matched.
Though it was not much , totally regretting it as it is easily marked and any attempts to wipe it off have resulted in paint coming off !
For the rest , we color matched. The cost savings were totally worth it. Infact, the soft buttery yellow tones I used for my son's room were available in Dulux rather than some of the other brands.