Generally I would argue that regardless of where they are collected, clones or not, you wont have any problems having them together.
Another observation I have noticed is that one magnifica may be something of an "alpha magnifica" and one or more additional specimens in the same aquarium may shrink in size, have thinner tentacles and otherwise appear to be hindered in growth.
fair enough, an accurate cautionary assessment. i will add that while the anemone may remain smaller and have noticeably thinner tentacles than the dominant anemone, all other aspects of its health remain fine: color and appetite remain unchanged and no deflation even years under these circumstances. i feel its an effect similar to a clownfish harem in which the dominant fish keeps the others small and passive...until the dominant animal moves on.
See everyone? This is how you have a civil disagreement on Reef Central. It can be done!!!