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Sounds like you are adding a slide and changing what is reported to the LMS. As a rule, we deem that significant enough to warrant a new version.

Here's the rub. While the new version will go out to anyone who is registered for the course after it is reversioned, the new version does not go out to users who already have the course on their transcripts by default unless you push the new version out to them. Also, reversion does require you to go back into the catalog and reset your populations/availability, etc. In order for users who are already registered in the course to get your new version, you will need to redo the proxy enrollment using the "Force" enrollment option. Some users may lose progress, so you may wish to evaluate specifically how many in progress users do you have and to whom do  you wish to push the new version.

Any time I can avoid a reversion, I do. We have successfully used slide count to log completions. The most common offender in the slide count is a lightbox or branching slide. That said if your course has a menu it should be pretty easy to determine if they missed a slide. We request a screen shot as proof for something like that.