Muskets and Mohawks and Long Rifle are compatible and you can shuffle characters from one rules set to the other. I decided to play a one unit Scout mission with British Allied Indians. I set up terrain as pictured below. The three PEFs (Possible Enemy Forces) were in the hills in the upper left corner (Green) and two in the woods to the right. These are placed after my forces enter the table.
The Orange PEF doesn't move. The Green one comes down from the cover of the hill and into sight in the clearing. This is resolved as a large war party of two units.
Now that the PEF is resolved I have to find out what they are doing. It appears that they are on a Raid mission! This will make them much more aggressive than if they were defending or scouting.
The next turn we activate first and I decide to beach the canoes. This will allow me to reverse them and head back down river should things go wrong. One enemy unit opens fire at us while the second moves towards us to the right. My Indians are shaken from the fire, take a casualty and retire away. The Orange PEF starts to move towards the river but is still out of sight.