For those needing collets - the ELU 3HP plunge router uses the exact collets the 1400 does, and we can assume the Dewalt 625 does as well as it's an ELU clone.
Even the wrench is identical to the 1400's. Looks like Festool does not make their own collets - alternative parts sources for the Dewalt might be a less expensive way to buy additional collets if you needed them.
JT