This is the question people actually type, usually as some form of "deluxe swirl containers", and it deserves a straight answer about what is known and what is not.
The sizes are different, and that is sourced. The Deluxe runs a 24 oz tub. The Swirl, like the classic CREAMi, runs a 16 oz pint. Ninja publishes both, and the sizing comparison across the CREAMi line is already well covered by others; we are not claiming it as a discovery, only citing it.
What Ninja settles. The classic 16 oz pint and the Deluxe 24 oz tub do not interchange: the tub "will NOT fit the NC299 or NC300", and the classic pint "will NOT fit the NC500". Owners confirm the mechanism, that only the 24 oz tub seats correctly in a Deluxe because the paddle is built for its depth, and that you can simply under-fill a 24 oz tub for a smaller batch.
What Ninja leaves open. The Swirl. Every Deluxe and classic exclusion line names the NC100, NC200, NC299 or NC300, and none of them names the NC700. The Swirl pint page, in turn, states only that it fits the NC700. So Ninja has never said whether a Deluxe tub works in a Swirl or a Swirl pint works in a Deluxe. The two are different sizes, and the 16 oz classic pint that shares the Swirl pint's size is a stated no-fit in the Deluxe, but nobody has tested the Swirl pairing directly and we are not going to invent a verdict for it.