Difference between floor plan & room size measurement

Houssmax floor plan provides both a layout & a room dimension data sheet (including total sqft calculation).

Sample – https://www.houssmax.ca/real-estate-floor-plan

However, the room size measurement only provides a dimension data sheet (not including total sqft calculation).

Sample – https://www.houssmax.ca/vtour/h8102369 *please check the file under “Document section”