After the meeting you promised to send the slides of your presentation in an email. But the deck you used, was the short one, and you have a better/longer one sitting on the shelf. It does have a different structure and graphical look and feel though. Should you send it instead?
Probably not. The slides you send are a quick reminder of the meeting, a permission to email the meeting attendees with your follow up question. Very few people might actually look at the slides in detail. And if they do, each slide is a visual placeholder for the story you told in the meeting. Sending a completely different deck might confuse them.
If you want to send the other presentation, do so in addition, and clearly mark it as something different from what they have seen.
More pro tips for follow up decks:
If slides contained semi-confidential information that was OK to show for 5 seconds, you can take them out in this version to prevent people from studying things in detail (financials, roadmaps, etc.)
Always send things in PDF, not the source file (PowerPoint .pptx, or SlideMagic .magic)
If you are using SlideMagic, consider expanding the explanation panels on each slide, and write the summary of the messages of the slide in a few paragraphs, handy for people to understand a page better when you are not there in the room to explain things verbally.