identifying young plants

Hi my son and i have taken on an allotment and have sent many hours getting as much ready as possible. to help we used a green hose to start seeds off but once they had grown quite large we pricked them out into single pots or seed trays were possible. But once they had been pricked out they name tabs were taken out and placed in the pots/trays in the hope of keeping them close to the same type of plant but over the last few weeks its aall been moved around and plants mixed. the plants we have mixed are cabbidge brocclie & collieflower  but we do not no which is which can anyone help. Thank you