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No. They are not the same. And the 650 boots are directional. One side faces the head, one faces the carbs. You can get them on backwards.
This is what a 550k boot looks like on an ‘82 650 head. The right boot is 550 and the left boot is 650. You can force it on with heat and lube but I would bet it’s almost impossible to get the carbs on all 4 at the same time. Also, the 650 boots have an offset in them and the 550 boots do not so it wouldn’t even line up.