A case won in supreme court after 20 years is review possible in service matters after 4 months

Review cannot be filed on any groud except for any error apprarent on the face , curative petition in supreme court is limited and you will be wasting more time and money in such effort.

yes you can but for that you have to file the special leave petition before the supreme court SLP is a special power, bestowed upon the Supreme Court of India to grant leave to appeal against any judgment in case any substantial constitutional question of law is involved, or gross injustice has been done

i have won case but the opposite party is thinking to file review but 30 days limitation has gone and they have implemented it but not according to the judgement we have sent a application that the judgement its written like this highlighting the main part in it can they review is my question a little bit confusion i won but they implemented the order of supreme court but wrongly can they review

Opposite party can't file review petition but instead they have to obey the order in right way as per court order instructions. 

If the court order is not executed properly then you can raise the objections to that in the execution court.

You first file an execution petition before the court competent to execute the court order as per procedures of law.

If the respondent do not comply then you can very well initiate contempt of court proceedings against him.