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Does anyone know any specific differences between the B/W and Technicolor versions of DOCTOR X?

I have a B/W 16mm print and want to verify that it is not merely a B/W copy of the color version.

Not very much. Most of the shots are the same takes as the Technicolor, simply fixed at alternate angles.

The quick way to check the difference, however, is Mae Busch's line in the brothel— in the Technicolor version, she says, "Didn't I meet you in Havana?" and in the black and white version, her quote is, "Didn't I meet you in Bermuda?"

Well, the black and white version lacks color.

Is that what you're looking for?

Bob

Thanks for the info (especially to Jack!).

It's probably a little ridiculous to post an answer to a 18 months old post, but I'm a newbie on this forum and, after all, better late than never.
The b&w and color versions of DOCTOR X are totally different movies, each one having been filmed separately - moreover, by two different Directors of Photography, Ray Rennahan for Technicolor, and Richard Towers for B&W. The cast is the same but the playing (and dialogue) can change in every version. The same goes for the camera's place, lightning, editing, etc. The Technicolor version is considered as the better, but the b&w version remains interesting from a historical point-of-view.
Part of the confusion came perhaps because b&w prints of the Technicolor version exist, and in fact I even saw it on French TV - it was the color version, no doubt about it, with the word "Technicolor" written in the credits, but shown in b&w...
The true b&w version (crediting Richard Towers) is a rarity these days, it almost disappeared after the discovery of the Technicolor superior version. I have both.
A complete, very detailed 10 pages article with a meticulous comparizon between the versions was written by Richard Harland Smith in Video Watchdog # 42, in 1997, under the title "The Two Faces of Doctor X".