Not quite. Some points are sold with adaptors already in them, and others you need to add the adaptor. Adaptors and inserts are not the same. Inserts are brass or aluminum threaded tubes that fit inside the arrow shaft to accept screw in adaptors and add weight to the arrow. Adaptors may be made out of aluminum, steel or titanium and vary in weight from 20 to 125 grains.
For example, a standard glue on Woodsman is 125 grains. An aluminum adaptor can be 15-25 grains depending on length. You can buy the components separately; sometimes the points are sold with the adaptors installed so the stated weight is obviously heavier. They screw into the insert in the shaft, which may be a 15-20 grain aluminum insert, or a 50,75 or 100 grain or heavier brass insert.