Generally if you get the same gauge it doesn't matter what yarn you use.
Here's the Gauge- this is the one you need to be concerned about. If you can get the same gauge you're fine. The reason it looked so light is they used a big needle.
CIRCULAR NEEDLE ( 32'') size /US 10 – or size needed to get 15 sts x 20 rows
in stockinette st with 1 thread of each quality = 4'' x 4''.
CIRCULAR NEEDLE (32'') size US 8 – for garter st.