A good photo of A-20s in formation. Note The J/K in the lead. You can see bombs falling from the wing racks too. Note also that #4 is a G/H. I have seen similar photos with 5 A-26Bs being led by an A-20J/K or A-26C. Only the lead flies the greenhouse bomber.
http://s1337.photobucket.com/user/Mark_Allen_M3/library/A-20?sort=3&page=1