Here you are some comparison images:
Top: DVD "a"; middle: laserdisc; bottom: DVD "b"
DVD "a" is NTSC interlaced 4:3; DVD "b" is NTSC progressive 16:9; laserdisc is the one I've cleaned up a bit to display better, but with no color correction.
The two DVD versions are effectively different, as DVD "a" miss the "this theater features" phrase on top of the "digital - dts - sound" at the end, present on both DVD "b" and laserdisc.
As you can see, DVD "a" has different shadows onto the "digital" letters; the color of "digital" is purple, similar between DVD "a" and laserdisc, while DVD "b" is blue... in second image, laserdisc "dts" is purplish, while the DVD are grey - I strongly suspect this is due to the fact that LD is a composite format, and color resolution is quite low...
Should I include the laserdisc version too? I am inclined to do so, because it could be considered the 4:3 version of DVD "b"!
Maybe I'll discover some other laserdisc trailers will be different "versions" of the same ones on DVD!