You are of course right, but note that they are different generations of the same (basic) font. MS SS is the initial, old, version of the newer Microsoft SS.
To note that there are DIFFERENT versions of Times New Roman (hereafter TNR) even if IN THE SAME GENERATION. For example, Leopard and newer Mac OS versions install a TNR version which has a richer repertoire than the version installed by MS Office for mac, and which is, in fact, another version of TNR, with many and essential differences.
And, last but not least, MS SS and the newer M$ SS do not intefere on the same installation, as the old generation is not installed any more. So, because the discussion started from here, if a text still uses the old MS SS, which has been replaced by the newer generation of M$ SS, then there may be of course problems related to text flow. The same if TNR is used, because, even if having the same, identical name, and produced and distributed by MS, one may have big trouble with TNR, the more so as they are all labelled identically.
There are also several generarions of Arials and Tahomas and... , which also lead to similar problems.
I added this comment just for the sake of informing all those interested in this issue.
Ditto.