  In this paper, first we study on Bour's theorem for four kinds of timelike
helicoidal surfaces in 4-dimensional Minkowski space. Secondly, we analyse the
geometric properties of these isometric surfaces having same Gauss map. Also,
we present the parametrizations of such isometric pair of surfaces. Finally, we
introduce some examples and draw the corresponding graphs by using Wolfram
Mathematica 10.4.
