Is it safe to use "uninsulated crimp" crimpers on insulated crimps?
The 2 stage crimps on wire and insulation are compressed by precise ratios of diameter against materials with different stiffness.  The difference between an under-compressed crimp that fails a 5 lb pull test and an over-crompressed crimp that displaces the material beyond some elastic limit that results in less spring tension is a fine line of skill.  The tool makes it easier to meet the force and compresssion size ratios to maximize the strength and make an gas-tight oxide-free bond.

But if you are desperate, go for it, but it has to survive a 5 lb pull test to be reliable on  a consistent basis, but you may get lucky .