Remember, in this case the ID of node must defined for each css class inside the css file.
In this line
you have 2 classes referred to tables:
.table-view:focused and
.table-row-cell:filled:focused:selected
So you should define the id for each of this classes to apply style to a specific table.
The css will become:
#IDTable .table-view:focused, #IDTable .table-row-cell:filled:focused:selected {
-fx-background-color: #84A082;
}
And this css will apply to the table with id = "IDTable" .
TableView1.ID = "IDTable"
I hope will help you.