Java Fat Client App Move from 1.3.1_07 to 1.3.1_20 Question

We have a third-party java fat client GUI front-end application here at work that is no longer under support from the vendor (they've moved to a web-based version to which we haven't yet upgraded). The version we have was originally developed and delivered with JRE 1.3.1_07, which we continue to use and push with our new build versions. Since 1.3.1_07 doesn't have the updated DST tables, the app displays the wrong time on its GUI. To upgrade to JRE 1.3.1_20, which does have the updated DST tables, can we simply copy the JRE folder and its subfolders and their contents over the 1.3.1_07 JRE folder we use in our builds? Or do we need to do something more than that? (I've done a low-level test of that and it seems to work...)

[743 byte] By [SLCGuya] at [2007-11-26 21:37:48]