Hello there @Divyesh_Commercient and welcome to the community!
I hope you like it here!
If by “field” you are referring to “columns”, you can create columns with the same ID in two different boards (not in the same one).
For example: If you create a column in board A with the ID “text5”, then you can not create another column in board A with the ID “text5”.
But you can create a column in board B with the ID “text5” if there was none in that board before.
Take into account that if you had a column of ID “text5” and you delete it, you will still not be able to use it again. It can only be used once.
Let me know if you have any questions!
Cheers,
Matias