Answered on FB, too, but figured I’d post here since it may help others with the difference:
“So, for charging, you’re getting the bonus due to impetus relayed from using all of your move and ending your turn next to your chosen target.
You still track and take a negative mod for every percentage of activity used to move in this way, but it is offset by the bonus of +1/foot moved in a straight line into your target.
For Move and Attack, you can use any combination of percentage activity to reach your target - up to 50% of your movement - but it then allows you to use whatever else is leftover once you reach said target:
Target is 20’ away and your PC has a BMR of 50’/rnd.
Whatever pace you decide upon gets you to your target and you opt for a bare minimum 50% attack.
Once resolved, your turn doesn’t *have* to end and many people forget this...you can still use up whatever amount of % activity is left from 100%-% activity used.
So if you have 25-30% leftover after reaching and attacking your target, you can take the Disengage action and get away in a type of Drive By attack without any kind of “AoO”.
If your GM doesn’t use sticky combat, you can just leave with whatever % activity you have left for free.”