Hello Cyrilp,
The change was only in the export function, so there is no need to regenerate the tiles.
Moreover, you can even convert already exported tiles using Agisoft Viewer utility using the following procedure:
- Open existing tileset in Agisoft Viewer using Add Layer... command from File menu
- Select Save Layer... command from the layer context menu in the Layers pane
- Select Cesium 3D Tiles format in the Save As dialog box and provide a filename for the converted tileset.