The files shown in SoundForge sound identical (well, to my ears anyway ).
So yeah, I cannot reproduce the problem.
As ImgBurn lists that the ACM Wrapper filter is being used, it means some *.acm (Audio Codec Manager) file is being added to the mix (rather that just pure DirectShow filters).
Assuming your filters are the same as mine, I guess it can only be some difference in the ACM filters that we both have installed.
Can you get a screenshot / listing of what yours are?
You can use this tool - http://www.nirsoft.net/utils/installed_codec.html
Turn off the video/directshow ones in the options (or view?) menu.