ee.ImageCollection.combine

Makes a new collection that is a copy of the images in primary, adding all the bands from the image in secondary with a matching ID. If there are no matching IDs, the resulting collection will be empty. This is equivalent to an inner join on ID with merging of the bands of the result.

Note that this algorithm assumes that for a matching pair of inputs, both have the same footprint and metadata.

Usage	Returns
ImageCollection.combine(secondary, overwrite)	ImageCollection

Argument	Type	Details
this: primary	ImageCollection	The primary collection to join.
secondary	ImageCollection	The secondary collection to join.
overwrite	Boolean, default: false	If true, bands with the same name will get overwritten. If false, bands with the same name will be renamed.