Legion is real close to 1:48 scale. Which makes 1:72 model about a third too small. It's quite notable. There are some 1:48 X-Wings available as well as a TIE Fighter that's pretty possible. But the 1:72 Ban Dai kits are just too small.
In case you're wondering, their 1:48 AT-ST is noticeably too small for Legion but their 1:48 scale Snowspeeder is a bit big, but only by about 1 cm. I intend to swap out the FFG Snowspeeder for the Ban Dai ones when I get around to doing those.