What Sir Alan said...
You can take just one screw out, not both, with hopes that a bit of the wood block remains and the screw keeps it from dropping into hull Probe the insides of the screw hole with a paper clip and see if you hit block, maybe the block is there but it has been stripped out. If so, dowel it with toothpicks and thickened epoxy.
Another trick is to drill a 1/8th inch hole about a 1/4 inch aft of the old hole, and see if wood shavings come out. If they do, keep in one screw to hold the block, take out the other screw, drill the second new hole, put some thickened epoxy in new hole and old hole, put in screw through cleat to new hole, take out first screw, put some thickened epoxy in second new hole and other old hole, move cleat over first new hole, insert screw.