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Here is one experiment I did. I used all yellow birds for this. You can get an estimate the xp, health and attack point gains by hovering your sacrifice bird over the box to see how it affects the bird you want to level up but not releasing.
I had two identical 1 star, two 2-stars of different levels, and two 3-stars of different levels.
I wrote down the expected gains with sacrificing the 1-star to the two 2-star and 3-stars (which would have cost 35 coins). I combined the identical 1 stars together (cost 35 coins).
I then compared again if I had sacrificed the higher level 1-star to both of the 2 and 3-star birds. The numbers were the same if I had not combined the identical birds at all (meaning I would be wasting 35 coins to join two birds that I could have later sacrificed individually and gotten a greater gain off of!).
I did the same comparison sacrificing the different level 2-star birds to the different level 3-star birds. Despite their levels, the gain numbers were the same.
Lesson is: stars matter, level doesn’t.