Is it possible to define vell width in a cell stile?
The layout (width) of all the existing table-columns must be the same.
No, dimensions can not be defined in a cell style.
Simply put: no, you cannot define the width of a cell with a cell stile.
If the overall width of a table is o.k. and you want to have even width in every column, just use the menu command for that task: "Distribute Columns Evenly".