How is this different from ‘timeshares’?

Fractional ownership makes you an owner of the real estate asset. The investor owns part of the title rather than units of time. If the asset increases in value, the value of the fraction in the investment does as well.

With most timeshares, you just have the right to use a facility during a fixed amount of time and specific dates of the year, but you are not the legal owner of the property.