Do the Battle of the Bulge plastic chips interlock (fit) with those in A&A Guadalcanal?
I can only speak for Battle of the Bulge and Guadalcanal as I own them both. The Guadalcanal chips are just a smidge bigger than those in BotB and do not interlock. The Guadalcanal chips are also a darker shade of grey then BotB. You can intermix the A&A Spring 1942 chips with Guadalcanal.
Hopefully somebody else can speak for the other combinations you mentioned.