Yes! Presumably the ACA1221(EC) just has the 14MHz 68EC020, thereby requiring no extra logic, just wire it straight to the bus.
I have often wondered why no accelerators run synchronously, for instance 28MHz 68030 or 56MHz 68060 &c...
EDIT: oh and the revision history is interesting, too
so now it WILL support:
* original Amiga disk drives
* clock port
* parallel port