Pretty sure BombingCC Doesn't stack? Isn't it one reroll per trigger up to unlimited number of reroll's if you have differing triggers for it.
the devs have already said it stacks.
by the rules you can have as many re-rolls as you have sources to trigger them.
for non-unique cards having the same name does not matter its a different source.
From Rules Reference:
"A "while" effect can be resolved during the specified event and cannot occur again during the instance of the event"
BCC : "While a friendly squadron with bomber at distance 1-5 is attacking a ship it may reroll 1 die"
So no, they do NOT stack.
They do stack, because although the event cannot occur again, there is no stated duration of the event. You resolve one, and then you resolve a different effect (that happens to have identical text) because the event in question has yet to conclude.
The stated duration is "attacking" "While attacking" so during the attack only one can resolve. Where as with Yavaris you get once per your two attacks.