It shouldn't be. I haven't played nor tested for a long time but there is a decent amount of changes from 1.134 to 1.158, actually 1.153 but whatever. I can assure you, there are at least a few bugs here and there. Best to port your all code from old MS to a new 1.158 MS using a text-comparing software like WinMerge then you will have no trouble as the coding structure is all the same.
