The biggest difference I have seen between the THGNT and the NA28, as far as readings go....
The THGNT went with the Byzantine reading for Luke 22:43-44, unlike the NA28
The are other times where the THGNT went with the Byzantine reading, but I can't recall specifics. The apparatus shows were that Byzantine reading has early manuscript support.
Example in Luke is the Byzatine reading is found in the orginal hand of 01, D, K, L, 1424 and others.
Going against p75 and Vaticanus
Sent from my SM-G965U using Tapatalk