No they are different. Dentured alcohol is very cheap here in the states. For the size bottle you will need its about 2 to 3 dollars so expense wise its very cheap.
Isopropyl Alcohol is only 10% by volume or 20 proof.
Denatured Alcohol is 100% by volume (no water) and is far more powerful than the topical medicinal stuff. I got a quart for $8 and the gallon was $18.