Just a little ceramic information to share as a potter. Vitrified simply means the clay has become glass like by being fired to its proper maturing temperature. Usually ceramic tile means it is a lower temperature clay like earthenware or terra cotta. Porcelain is fired to the highest temperature and is more vitrified if you will. This usually means it is less porous to to absorb water and harder. Low fired ceramics with glazes much darker or lighter than the clay body will show chips easier. Rectified has to do with making the edges precise enough to fit smoothly together for less grout lines. So porcelain cost more to produce but it is more sturdy. All clay tiles should be vitrified.

On the floor. These are vitrified tiles in timber teak digital print. I want to use them in the rooms and kitchen. My dilemma is, whether I can use same in kitchen or I should used another design for kitchen.

White and same wood colour is Good colour combination

Hello, You may have to remove them , take them to nearest timber get them planed and then reinstall. after planing you may have to buy few additional pieces to cover up the material lost in planing. Otherwise, If the gaps are not very big you can try filling them with metal paste or wood putty.