Looks good. We had something a little similar just before Christmas. An old 1950s quarry tile stairwell. We knew that when we were to start cleaning there would be grout loss. Got the client to choose what colour grout they wanted. Explained that it would be a different texture/appearance etc to the existing. Did the patch in. Client not happy. Explained the qualifications again did a sample step with colour sealer and they went ahead with all 5 flights of stairs as an extra! Would have been great if we had the time to fit it in so after many long hours it all looks great and NOBODY TOOK ANY PICS! It was Christmas Eve to be fair.