CF9.0.1 + CHF4 and IIS 6 32-bit application pools: question of versions of wsconfig.jar?

I did a test installation update to CF9.0.1 + CHF4 and then updated the wsconfig.jar on the remote IIS 6 web servers, running 32-bit application pools. The IIS connections to the remote backend ColdFusion servers failed; I fell back to the older wsconfig.jar

The wsconfig.jar that is updated with the ColdFusion 9 Update 1 does not work with our IIS6 web 32-bit app pools; the older wsconfig.jar [JRun 4.0 (Build 108795) JRun ISAPI Extension - Aug 29 2009 11:51:27] DOES work with the 32-bit application pools.

Question:  can I safely run the older wsconfig.jar on the IIS 6 32-bit application pools [JRun 4.0 (Build 108795) JRun ISAPI Extension - Aug 29 2009 11:51:27] with CF 9.0.1 + CHF4?

We are running in distributed mode.

Thanks,

Scott