Hi

If you have domicile of Gujrat state only then you are eligible for state quota of Gujrat in state counseling.

However you can take part in All India counseling for admission in any state.

Considering your caste certificate, it can be considered as your caste certificate all over India. But if you don't have domicile of Maharashtra state then you can not take part in Maharashtra state counseling.

For more details, feel free to refer to this article-

https://medicine.careers360.com/articles/neet-domicile-criteria

Best of luck