Cash'n Fruits 256 Hold And Win expands the fruit grid to four reels with four positions each. Three gold coins trigger the respin feature, which starts with three remaining attempts. A newly landed coin resets that counter, and the feature ends when attempts run out or all sixteen positions are filled. Filling the grid is a separate condition from merely triggering the bonus. This sixteen-cell layout is the practical difference to check when comparing a fifteen-cell Cash'n Fruits edition.
To compare related slots formats, read the rules of Dolphin's Wealth Fortune and Lucky And Brave Fortune.
The library also explains the difference between lines, ways and clusters to help put these mechanics in context.
Source: published game information.