"Inside Deep Throat" - "R" rated vs. "NC-17"

What is the difference between the two versions? mikeargo wants to know for “research” purposes.

I haven’t seen the movie but in the NC-17 version I believe they have some explicit excerpts from some of Lovelace’s X-rated movies that were edited down in the R-rated version.

I did see the NC-17 version, and there is one explicit, slow-motion, few-seconds-long shot of Linda Lovelace giving a blowjob.