If you have uploaded a photo in which there was no date and name, the smae would be used by NTA for your Admit card as well. SO there is nothing that can be done at this point in time. But yes, when you are pasting a passport size photograph on the NEET admit card, please use a similar photo and so there will be no issue. Also use the same photograph for the self declaration form and take a similar photograph for the attendance sheet. That way the resemblance can be identified. On the day of the exam, you are only allowed to carry with you:

2 passport size photographs

NEET Admit card

Self declaration form

Valid Id proof

PWD certificate if applicable

50ml sanitiser

Transparent water bottle

Masks and gloves