The old hemdale LD is print sourced and the remastered seems to be from an IP. The MGM disc should have had access to the master monk source wh would be without and compression and EQ for Dolby mono theatrical formatting.
This link suggests the Hemdale release is also sourced from an IP print
http://www.lddb.com/laserdisc/01669/ID2940NSB/Terminator-The