IGBT Replacement for IRFP450

I am currently using a circuit to drive a plasma sculpture using a flyback driver.

It is a 1/2 bridge design using an AC driven IR 2153 oscillator. See attached. I have on hand a few IGBTs and was wondering what would happen if I used either a HGTG40N60A4 or a G40N60A4 as a substitute for the two MOSFET IRFP450s??