Aircraft Recognition Guide

The T-38C variant is a significantly upgraded A or B model. Externally it is best recognised by the perpendicular air intakes, with an oval cross section and smaller splitter plates against the fuselage. Additionally, the exhausts have ring-shaped openings halfway the jet pipe.

The four seat Piper PA-44 Seminole is one of the few piston twins with a T-tail. Still is looks very similar to the Beech 76 Duchess. You can learn about the differences on the page https://www.aircraftrecognitionguide.com/piper-pa-44.