Subdivision Plat Overlay Visuals

I need visual aids that overlay new subdivision plats on existing ones to show changes in lot lines and sizes. The original subdivision plats are in PDF format.

Requirements:
- Basic outlines of both lot lines and sizes, then overlay next plat to show changes in lots -- there are about 20 of these plats. So I will need to have the ability to zoom in/out of the map(s) to highlight particular areas for presentation.
- Clear, easy-to-read overlays adaptable to powerpoint

Ideal Skills:
- Familiarity with real estate plats or surveys
- Proficiency in handling PDF files
- Experience with creating visual overlays using your preferred mapping software (as long as the result can be displayed in PDF, JPG, TIFF, etc.)
- Attention to detail
Experience with putting these overlays into powerpoint or other presentation software would be a bonus.