Mixing counters

[plloyd1010]

Mostly the unit counters are mixable, provided you pay attention. Leaders, as you noted, and aircraft are not. I suggested marking leaders with some code for sorting them when it comes to games that mix leader sets,

Beyond that, this what I've noted:
Going from 1st/2nd Ed, some German AFVs (like the PzKwIVe) got shorter ranges. The Soviet 76.2mm field gun has its bombardment strength reduced from 12 to 10.
When John Stafford took over as editor, heavy weapon platoon reduced DF factors became ½ rounded up. Before then, nearly all of them were ½ rounded down.
A couple AFVs have had armor values changed. The Brumbar comes to mind.
As Drew noted, 1st release of Saipan had marines with a DF of 10, later releases are DF 8.
Fireflys have had their AT values increased to 8-8 with Lib'44. BN had them at 6-7.

There may be others, but I can't remember them right off. Just check first before moxing.