If they don't smell and tend to stay a lot shorter, they're more likely to be the asiatics. If they grow a lot taller and have a smell (that I personally love), they're probably the oriental type.

Trumpet and daylilies (along with lily of the valley, calla lily, toad lily, easter lily, turk's cap, and several others, are a lot easier to tell apart based on looks, but the Asiatic and Oriental types always confuse me until I smell them!

Some references (which, I have to use something as reference every year):

• https://bygl.osu.edu/node/1096
• https://worldoffloweringplants.com/difference-asiatic-oriental-lilies/
• https://www.thespruce.com/asiatic-lily-care-guide-7510540 (which is where I get reminded "Unlike Oriental lilies, which bloom in late summer and are known for their aroma, Asiatic lilies bloom in late spring or early summer and have little to no scent.")