The Home Depot listing for the Dewalt chain (that is out of stock) says 68 DL. But it certainly could be wrong.
For a 3/8LP .050" you have a few choices:
Oregon 91PX is a good choice for a homeowner. 91PX068G for 68DL or 91PX072G for a 72DL. Safety chain. Modified semi chisel.
91PXL also a safety chain but not as much. Does not come in 68DL though (66 or 70).
91VXL is a more aggressive non safety chain. Semi chisel.
You could also use a Stihl 63PS3 safety chain or 63PS non safety chain. 63PS is a fantastic chain, very hard and cuts fast.
For my saw I would probably seek out 63PS first and then 91VXL second. But you said it is for someone else, so judge their experience accordingly...
Here is one place that has the Oregon chains in stock.
https://loggerchain.net/collections...chain-3-8-low-profile-050-gauge-68-drive-link