If I remember correctly, the ECS CDXLs are quarter screen,
while the AGA CDXLs are one third screen.
The Microchrosm(?) Title demo on the CD32 demo-CD #2 can be streached to full-width with some controller-button but, of course, that just makes the picture distorted.*
The CD32 Scientist & Cyborg ad is on that CD, as a MPEG1, and as a AGA CDXL.
Speaking of the Developer CD v1.1 (1996) - there's an ECS CDXL there of a speedboat+waterskier which, IIR, is in 16colours.
(* I could be wrong there - the STREACH may be vertical)