Jha's translation, also published in GOS, is definitely a translation of the GOS edition of text and commentary.
http://www.dli.ernet.in/cgi-bin/metainfo.cgi?&title1=Tattvasangraha%20Of%20Santaraksita%20%20vol.%202&author1=Krishnamacharya,%20Embar,%20ed.&subject1=RELIGION.%20THEOLOGY&year=1926%20&language1=sanskrit&pages=470&barcode=4990010223407&author2=NULL&identifier1=NULL&publisher1=R.%20T.%20Vyas,%20Baroda&contributor1=Vyas,%20R.%20T.,%20ed.(Series)&vendor1=NONE&scanningcentre1=cdack&slocation1=NONE&sourcelib1=THE%20ASIATIC%20SOCIETY,%20KOLKATA&scannerno1=0&digitalrepublisher1=Digital%20Library%20Of%20India&digitalpublicationdate1=2007-05-23&numberedpages1=0&unnumberedpages1=0&rights1=In%20Public%20Domain©rightowner1=NULL©rightexpirydate1=0000-00-00&format1=Tagged%20Image%20File%20Format%20&url=/data3/upload/0077/638
I have so far failed to find a scan of volume one of this edition.