The firing order is 123456.

If one side has no compression, it shoud crank (without spark or fuel) like thump whoosh thump whoosh etc.

Shine a light in the plug hole and look at the top of the pistons - should see valve scars if it dinged them.

Look at the valve heights on the dinged side - if the valves are bent, some valves that are not depressed by the cam should be lower than the undinged side. Maybe not much, but measurable.

Not responsible for advice not taken...