You can probably substitute a chunky yarn to get gauge but you may not have the drape and feel of the original knit.
Patons Shetland Chunky and Beehive Shetland Chunky are both 3 ply yarns but the Shetland Chunky lists as 15sts/4" while the Beehive Shetland Chunky lists at 12-15sts/4". A gauge swatch will help sort this out.
Patons Inspired is on yarnsub.com where they also check for texture and fiber content among other qualities. It’s listed as a good match for the Shetland Chunky. They find Plymouth Encore Chunky is an excellent substitute for this yarn.
https://yarnsub.com/yarns/patons_north_america/inspired