George, I would not be able to tell you about different versions of MATLAB, but to find out what changed between certain versions of LabVIEW, it would be best to look at LabVIEW release notes for the specific version. The latest one can be found here:
<a href="http://digital.ni.com/manuals.nsf/websearch/0FB36A66EDEA837A86256E40007051FF?OpenDocument&node=132090_US";>LabVIEW Release Notes</a> LabVIEW 7.1 supports MATLAB versions 6.5 and earlier. LabVIEW 6.x and earlier does not interface properly with MATLAB 6.1 or MATLAB 6.5. Zvezdana S. National Instruments
